Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Trading Arrangement: Trading Arrangement [Axis] Maximum [Member] Maximum [Member] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Customer [Domain] Customer Domain [Domain] Customer [Domain] 7.125% Debentures Due 2025 [Member] 7.125 Percent Debentures Due 2025 [Member] 7.125% Debentures Due 2025 [Member] Net unrealized (gain) loss from commodity derivative instruments Unrealized Gain (Loss) on Derivatives and Commodity Contracts Title of 12(b) Security Title of 12(b) Security Carrying Amount [Member] Reported Value Measurement [Member] Subsequent Event [Member] Subsequent Event [Member] Fair Value Measurements, Nonrecurring [Table Text Block] Fair Value Measurements, Nonrecurring [Table Text Block] Adjustment to Compensation, Amount Adjustment to Compensation Amount Financial Instrument [Axis] Financial Instrument [Axis] Segment Reporting [Abstract] Segment Reporting [Abstract] Guarantor Obligations, Maximum Exposure, Undiscounted Guarantor Obligations, Maximum Exposure, Undiscounted 5.95 Percent Senior Unsecured Notes Due 2056 5.95 Percent Senior Unsecured Notes Due 2056 [Member] 5.95 Percent Senior Unsecured Notes Due 2056 Deferred: Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Contract with Customer, Asset, Net - Beginning of Period Contract with Customer, Asset, Net - End of Period Contract with Customer, Asset, after Allowance for Credit Loss Derivative Instrument [Axis] Derivative Instrument [Axis] Subsidiary of Limited Liability Company or Limited Partnership [Line Items] Subsidiary of Limited Liability Company or Limited Partnership [Line Items] Measurement Frequency [Axis] Measurement Frequency [Axis] Total Current Income Tax Expense (Benefit) Proceeds from sale of asset retirement obligations trust investments Proceeds from Decommissioning Trust Fund Assets Consolidated Entities [Axis] Consolidated Entities [Axis] Consolidated Entities [Axis] Revenue Not from Contract with Customer, Other Revenue Not from Contract with Customer, Other Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment Business Combination, Recognized Asset Acquired, Property, Plant, and Equipment Leases [Abstract] Leases [Abstract] Other Significant Noncash Transaction, Value of Consideration Received Other Significant Noncash Transaction, Value of Consideration Received Natural gas storage service Natural Gas, Storage [Member] Consolidated Entities [Domain] Consolidated Entities [Domain] Contract with Customer, Liability, Increase (Decrease) for Contract Acquired in Business Combination Contract with Customer, Liability, Increase (Decrease) for Contract Acquired in Business Combination Private Equity Funds, Non-US Private Equity Funds, Non-US [Member] Other financial information: Other Financial Information [Abstract] Other financial information. Common Stock, Par or Stated Value Per Share Common Stock, Par or Stated Value Per Share Stock Repurchase Program Cumulative Amount Purchased Stock Repurchase Program Cumulative Amount Purchased Cumulative amount of stock repurchased under the repurchase plan. Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Quarters Ending Time [Domain] Quarters Ending Time [Domain] [Domain] for Quarters Ending Time [Axis] Number of Reportable Segments Number of Reportable Segments 5.15 Percent Senior Unsecured Notes Due 2036 5.15 Percent Senior Unsecured Notes Due 2036 [Member] 5.15 Percent Senior Unsecured Notes Due 2036 Total current liabilities Total current liabilities Liabilities, Current Ownership Type [Axis] Ownership Type [Axis] Ownership Type Taxes, other than income taxes Taxes, Miscellaneous Schedule of Derivative Instruments Schedule of Derivative Instruments [Table Text Block] Derivative Liability, Current Derivative Liability, Current Entity Address, City or Town Entity Address, City or Town Reclassification Of Contract Liabilities To Liabilities Held For Sale Reclassification Of Contract Liabilities To Liabilities Held For Sale Reclassification Of Contract Liabilities To Liabilities Held For Sale Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Product [Member] Product [Member] Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Entity Well-known Seasoned Issuer Entity Well-known Seasoned Issuer Other Comprehensive Income (Loss), Net of Tax Other comprehensive income (loss) Other Comprehensive Income (Loss), Net of Tax Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag] Lessor, Operating Lease, Payment to be Received, Year Three Lessor, Operating Lease, Payment to be Received, Year Three Additional disclosures: Additional Fair Value Elements [Abstract] Interest Rate Derivatives, at Fair Value, Net Interest Rate Derivatives, at Fair Value, Net Subsequent Event Type [Axis] Subsequent Event Type [Axis] Schedule of Long-term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Environmental Restoration Costs Environmental Restoration Costs [Member] Business Combination, Recognized Liability Assumed, Other Liability, Current Business Combination, Recognized Liability Assumed, Other Liability, Current Reconciliation of revenue from segment to consolidated [Table Text Block] Segment Reporting [Table Text Block] Municipal Bonds Municipal Bonds [Member] Impairment of Long-Lived Assets to be Disposed of Impairment of Long-Lived Assets to be Disposed of Related Party [Axis] Related and Nonrelated Parties [Axis] 5.6 Percent Senior Unsecured Notes Due 2035 5.6 Percent Senior Unsecured Notes Due 2035 [Member] 5.6 Percent Senior Unsecured Notes Due 2035 Capital Addition Purchase Commitments [Member] Capital Addition Purchase Commitments [Member] Lessee, Operating Lease, Liability, Maturity [Table Text Block] Lessee, Operating Lease, Liability, to be Paid, Maturity [Table Text Block] Income (loss) from discontinued operations (Note 1) Net Income (Loss) from Discontinued Operations Available to Common Shareholders, Basic Document Period End Date Document Period End Date NG3 [Member] NG3 [Member] NG3 Liabilities held for sale (Note 3) Disposal Group, Including Discontinued Operation, Liabilities, Current Long-term debt face amount Debt Instrument, Face Amount Basic earnings (loss) per common share: Earnings Per Share, Basic [Abstract] Commercial paper, maximum maturity Debt Instrument, Term Business Combination, Recognized Liability Assumed, Long-Term Debt, Noncurrent Business Combination, Recognized Liability Assumed, Long-Term Debt, Noncurrent Crude Oil Crude Oil [Member] Fair Value, Inputs, Level 1, 2 and 3 [Member] Fair Value, Inputs, Level 1, Level 2, and Level 3 [Member] Contributions from noncontrolling interests Proceeds from Noncontrolling Interests Long-Lived Asset, Held-for-Sale, Fair Value Disclosure Long-Lived Asset, Held-for-Sale, Fair Value Disclosure Lessor, Operating Leases Lessor, Operating Leases [Text Block] Income Tax Paid, Federal, after Refund Received Income Tax Paid, Federal, after Refund Received Conway Fractionator [Member] Conway Fractionator [Member] Conway Fractionator [Member] Accumulated other comprehensive income (loss) Accumulated Other Comprehensive Income (Loss), Net of Tax Entity Shell Company Entity Shell Company Consolidation Items [Domain] Consolidation Items [Domain] Contract With Customer, Asset [Table] Contract With Customer, Asset [Table] Contract With Customer, Asset Document Fiscal Period Focus Document Fiscal Period Focus Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Accounts receivable Increase (Decrease) in Accounts and Notes Receivable Debt Securities, Trading, and Equity Securities, FV-NI Debt Securities, Trading, and Equity Securities, FV-NI Trading Symbol Trading Symbol Measurement Input, Discount Rate [Member] Measurement Input, Discount Rate [Member] 4.3% Senior Unsecured Notes Due 2024 [Member] 4.3 Percent Senior Unsecured Notes Due 2024 [Member] 4.3% Senior Unsecured Notes Due 2024 [Member] Construction Project Construction Project [Member] Construction Project Capital expenditures (1) Capital expenditures Payments to Acquire Property, Plant, and Equipment Appalachia Midstream Services, LLC [Member] Appalachia Midstream Services, LLC [Member] Appalachia Midstream Services, LLC [Member] Business Combination, Recognized Asset Acquired and Liability Assumed Business Combination, Recognized Asset Acquired and Liability Assumed [Table Text Block] Company Selected Measure Name Company Selected Measure Name Dividends and distributions paid to noncontrolling interests Payments of Ordinary Dividends, Noncontrolling Interest Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Energy Related Derivative Energy Related Derivative [Member] Diluted earnings (loss) per common share: Earnings Per Share, Diluted [Abstract] 7.85% Senior Unsecured Notes Due 2026 [Member] 7.85 Percent Senior Unsecured Notes Due 2026 [Member] 7.85% Senior Unsecured Notes Due 2026 [Member] 5.80 Percent Senior Unsecured Notes Due 2036 5.80 Percent Senior Unsecured Notes Due 2036 [Member] 5.80 Percent Senior Unsecured Notes Due 2036 Credit Facility [Domain] Credit Facility [Domain] OPERATING ACTIVITIES: Cash Provided by (Used in) Operating Activity, Including Discontinued Operation [Abstract] Other Receivables, Net, Current Other Receivables, Net, Current Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Internal Revenue Service (IRS) [Member] Internal Revenue Service (IRS) [Member] Disposal Group Name [Domain] Disposal Group Name [Domain] Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less) Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less) Line of Credit Facility [Table] Line of Credit Facility [Table] Blue Racer Midstream LLC [Member] Blue Racer Midstream LLC [Member] Blue Racer Midstream LLC Business Combination, Goodwill, Expected Tax Deductible, Amount Business Combination, Goodwill, Expected Tax Deductible, Amount Contract with Customer, Asset, Increase (Decrease) for Contract Acquired in Business Combination Contract with Customer, Asset, Increase (Decrease) for Contract Acquired in Business Combination Affiliate receivables Increase (Decrease) in Accounts Receivable, Related Parties Award Timing Predetermined Award Timing Predetermined [Flag] Product Costs And Net Realized Processing Commodity Expenses Product Costs And Net Realized Processing Commodity Expenses Product Costs and Net Realized Processing Commodity Expenses Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Lessor, Lease, Description [Table] Lessor, Lease, Description [Table] Advances to affiliate – net IncreaseDecreaseInAdvancesToAffiliates The increase (decrease) during the reporting period in the amount owed to the reporting entry (during the current year or operating cycle) in the form of demand notes. Status Of Gain (Loss) [Domain] Status Of Gain (Loss) [Domain] Status Of Gain (Loss) [Domain] Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest Income (loss) from continuing operations Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Preferred Stock, Par or Stated Value Per Share Preferred Stock, Par or Stated Value Per Share Long-term debt, including current portion Long-Term Debt, Fair Value Changes in current and noncurrent commodity derivative assets and liabilities Increase (Decrease) in Derivative Assets and Liabilities Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain] Unconditional Purchase Obligation, Category of Goods or Services Acquired [Domain] Scenario [Domain] Scenario [Domain] Deferred income tax liabilities Deferred Tax and Other Liabilities, Noncurrent Purchase of asset retirement obligations trust investments Payments to Acquire Investments to be Held in Decommissioning Trust Fund Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Long-term debt due within one year Long-Term Debt and Lease Obligation, Current Credit facility, loans outstanding Long-Term Line of Credit Lessor, Operating Lease, Payment to be Received, Fiscal Year Maturity [Abstract] Lessor, Operating Lease, Payment to be Received, Fiscal Year Maturity [Abstract] Common dividends paid Payments of Ordinary Dividends, Common Stock Expiration Date Trading Arrangement Expiration Date Line Of Credit Facility Maximum Borrowing Capacity After Available Increased Commitments Line Of Credit Facility Maximum Borrowing Capacity After Available Increased Commitments Maximum borrowing capacity under the credit facility after considering the available additional increase to such commitments. State Current State and Local Tax Expense (Benefit) 4.9 Percent Senior Unsecured Notes Due 2029 4.9 Percent Senior Unsecured Notes Due 2029 [Member] 4.9 Percent Senior Unsecured Notes Due 2029 Total equity Beginning balance Ending balance Equity, Including Portion Attributable to Noncontrolling Interest Third-party Nonrelated Party Nonrelated Party [Member] Affiliated Entity Affiliated Entity [Member] Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Lessor, Operating Lease, Payment to be Received, after Year Five Lessor, Operating Lease, Payment to be Received, after Year Five Proceeds from issuance of common stock Proceeds from Issuance of Common Stock Business Combination, Recognized Asset Acquired, Receivable, Current Business Combination, Recognized Asset Acquired, Receivable, Current Trade and other accounts receivable Increase (Decrease) in Accounts and Other Receivables Business Combination, Achieved in Stages, Preacquisition Equity Interest in Acquiree, Fair Value Business Combination, Achieved in Stages, Preacquisition Equity Interest in Acquiree, Fair Value INVESTING ACTIVITIES: Cash Provided by (Used in) Investing Activity, Including Discontinued Operation [Abstract] Entity Voluntary Filers Entity Voluntary Filers Business Combination, Pro Forma Information, Pro Forma Income (Loss), after Tax Business Combination, Pro Forma Information, Pro Forma Income (Loss), after Tax DocumentFinStmtErrorCorrectionFlag Document Financial Statement Error Correction [Flag] Lessor, Operating Lease, Payment to be Received, Year One Lessor, Operating Lease, Payment to be Received, Year One Segments [Domain] Segments [Domain] Consolidated Permian Gathering Assets Consolidated Permian Gathering Assets [Member] Consolidated Permian Gathering Assets Debt and Banking Arrangements [Text Block] Debt Disclosure [Text Block] Scenario [Axis] Scenario [Axis] Changes in related accounts payable and accrued liabilities Increase (Decrease) in Accounts Payable And Accrued Liabilities Related To Capital Expenditures The increase (decrease) during the reporting period in future cash outflows for liabilities incurred associated with capital expenditures. Business Combination [Table] Business Combination [Table] Acquisitions and Divestitures [Text Block] Mergers, Acquisitions and Dispositions Disclosures [Text Block] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Accounts Payable, Trade, Current Accounts Payable, Trade, Current Total costs and expenses Total costs and expenses Costs and Expenses Purchases of and contributions to equity-method investments Payments to Acquire Equity Method Investments Long-term debt interest rate Debt Instrument, Interest Rate, Stated Percentage Dividends, Common Stock, Cash Dividends, Common Stock, Cash Total stockholders’ equity Equity, Attributable to Parent Business Combination, Recognized Asset Acquired, Other Asset, Noncurrent Business Combination, Recognized Asset Acquired, Other Asset, Noncurrent Basis Risk Basis Risk [Member] Basis Risk ASSETS Assets [Abstract] Assets [Abstract] Measurement Input, EBITDA Multiple [Member] Measurement Input, EBITDA Multiple [Member] Business Combination, Consideration Transferred, Equity Interest, Share Issued, Number of Shares Business Combination, Consideration Transferred, Equity Interest, Share Issued, Number of Shares Fair Value, Nonrecurring [Member] Fair Value, Nonrecurring [Member] Insider Trading Policies and Procedures [Line Items] Acquired Finite-lived Intangible Asset, Weighted-Average Period before Renewal or Extension Intangible Asset, Finite-Lived, Acquired, before Renewal or Extension, Weighted-Average Period Accounts Receivable, Allowance for Credit Loss, Current Accounts Receivable, Allowance for Credit Loss, Current (1) Increases to property, plant, and equipment (1) Increases to property, plant, and equipment, exclusive of equity AFUDC Property, Plant, and Equipment, before Accumulated Depreciation, Addition Total Deferred Income Tax Expense (Benefit) General and Description Of Business [Abstract] Description Of Business [Abstract] Description Of Business [Abstract] Regulatory Assets, Current Regulatory Asset, Current Proportional Modified EBITDA Equity Method Investments Proportional Modified EBITDA Equity Method Investments Proportional Modified EBITDA Equity Method Investments Indirect Ownership Interest Indirect Ownership Interest [Member] Indirect Ownership Interest 4.8 Percent Senior Unsecured Notes Due 2029 4.8 Percent Senior Unsecured Notes Due 2029 [Member] 4.8 Percent Senior Unsecured Notes Due 2029 Business Combination Acquisition Related Costs Cumulative Business Combination Acquisition Related Costs Cumulative This element represents cumulative acquisition-related costs incurred to effect a business combination which costs have been expensed. Entity Central Index Key Entity Central Index Key AllOtherEntitiesInWhichOwnershipIsDisclosed AllOtherEntitiesInWhichOwnershipInterestIsDisclosed [Member] All Other Entities In Which Ownership Interest Is Disclosed Accumulated depreciation, depletion, and amortization Property, Plant, and Equipment, Accumulated Depreciation, Depletion, and Amortization Capital in excess of par value Additional Paid in Capital, Common Stock Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Discovery Acquisition Discovery Acquisition [Member] Discovery Acquisition Indemnification Agreement [Member] Indemnification Agreement [Member] Other Stockholders' Equity, Other Ownership [Axis] Ownership [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Maximum ratio of debt to capitalization Maximum Ratio Of Debt To Capitalization The maximum ratio of debt to capitalization (defined as net worth plus debt) permitted under the covenants. Louisiana LNG LLC Louisiana LNG LLC [Member] Louisiana LNG LLC Schedule of Equity Method Investment, Equity Method Investee, Name [Axis] Investment, Name [Axis] Investment, Name [Axis] Driftwood Pipeline LLC Driftwood Pipeline LLC [Member] Driftwood Pipeline LLC Schedule of Components of Provision (benefit) for income taxes [Table Text Block] Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Reportable Segment, Aggregation before Other Operating Segment Reportable Segment, Aggregation before Other Operating Segment [Member] Derivative Notional Amount Terminated Derivative Notional Amount Terminated Nominal or face amount used to calculate payment on derivatives for agreements terminated during the period. NonRegulated Service Monetary Consideration [Member] NonRegulated Service Monetary Consideration [Member] NonRegulated Service Monetary Consideration [Member] Business Combination, Recognized Asset Acquired, Other Asset, Current Business Combination, Recognized Asset Acquired, Other Asset, Current Accumulated Other Comprehensive Income (Loss) AOCI Attributable to Parent [Member] All Individuals All Individuals [Member] Percentage Of Finite Lived Intangible Assets Impacted By Our Intent Or Ability To Renew Or Extend Arrangement Percentage Of Finite Lived Intangible Assets Impacted By Our Intent Or Ability To Renew Or Extend Arrangement Percentage Of Finite Lived Intangible Assets Impacted By Our Intent Or Ability To Renew Or Extend Arrangement Statement [Line Items] Statement [Line Items] Total assets Total assets Assets Acquisition Trigger Amount Acquisition Trigger Amount Aggregate amount of acquisitions that will result in a temporary change in the Debt to EBITDA ratio requirement. Business Combination [Abstract] Business Combination [Abstract] Amounts attributable to The Williams Companies, Inc. available to common stockholders: Income Amounts Attributable to Parent, Disclosures [Abstract] Deferred tax liabilities and Deferred tax assets [Table Text Block] Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Other Accounts Receivable Other Accounts Receivable [Member] Other Accounts Receivable [Member] NonRegulated Service Commodity Consideration [Member] NonRegulated Service Commodity Consideration [Member] NonRegulated Service Commodity Consideration [Member] Variable Interest Entity, Not Primary Beneficiary [Member] Variable Interest Entity, Not Primary Beneficiary [Member] Operating Segments [Member] Operating Segments [Member] Interest expense Interest Expense, Nonoperating Business Combination, Recognized Liability Assumed, Liability Business Combination, Recognized Liability Assumed, Liability PEO PEO [Member] Other Liabilities, Noncurrent Other Liabilities, Noncurrent Goodwill Goodwill Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount 5.40 Percent Senior Unsecured Notes Due 2026 5.40 Percent Senior Unsecured Notes Due 2026 [Member] 5.40 Percent Senior Unsecured Notes Due 2026 Performance Obligation Source [Axis] Performance Obligation Source [Axis] Performance Obligation Source [Axis] Retained Deficit Retained Earnings Retained Earnings [Member] Cash management funds Money Market Funds [Member] Revolving Credit Facility Revolving Credit Facility [Member] MountainWest [Member] MountainWest [Member] MountainWest Allowance for equity and borrowed funds used during construction (AFUDC) Public Utilities, Allowance for Funds Used During Construction, Additions Accounts Receivable Related To Contracts With Customers [Member] Accounts Receivable Related To Contracts With Customers [Member] Accounts Receivable Related To Contracts With Customers [Member] Award Timing Disclosures [Line Items] Net income (loss) available to common stockholders - Diluted Earnings Per Share, Diluted Public Utilities General Disclosures Public Utilities General Disclosures [Table Text Block] Transmission, Power & Gulf [Member] Transmission, Power & Gulf [Member] Transmission, Power & Gulf Segment [Member] Ownership [Domain] Ownership [Domain] Business Combination, Recognized Asset Acquired, Asset Business Combination, Recognized Asset Acquired, Asset Revenue from Contract with Customer, Excluding Assessed Tax Revenue from Contract with Customer, Excluding Assessed Tax IndexRisk IndexRisk [Member] Index Risk Assets held for sale (Note 3) Disposal Group, Including Discontinued Operation, Assets, Current Changes in ownership of consolidated subsidiaries, net (Note 1) Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Net Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Other current liabilities Increase (Decrease) in Other Current Liabilities 6.0 Percent Senior Unsecured Notes Due 2055 6.0 Percent Senior Unsecured Notes Due 2055 [Member] 6.0 Percent Senior Unsecured Notes Due 2055 Lessor, Operating Lease, Term of Contract Lessor, Operating Lease, Term of Contract Schedule of Maturities of Long-term Debt [Table Text Block] Schedule of Maturities of Long-Term Debt [Table Text Block] Realized Derivative, Gain (Loss) on Derivative, Net Natural Gas Underground Storage Facilities [Member] Natural Gas Under Ground Storage Facilities [Member] Natural gas underground storage facilities. ARO Trust investments Asset Retirement Obligation, Legally Restricted Assets, Fair Value Operating income (loss) Operating income (loss) Operating Income (Loss) Service [Member] Service [Member] Revenue, Remaining Performance Obligation, Amount Revenue, Remaining Performance Obligation, Amount Total Members' Equity Balance at beginning of period Balance at end of period Total Members' Equity Members' Equity Revenue Recognition [Abstract] Revenue Recognition [Abstract] 5.60 Percent Senior Unsecured Notes Due 2033 5.60 Percent Senior Unsecured Notes Due 2033 [Member] 5.60 Percent Senior Unsecured Notes Due 2033 Cogentrix Co-Investment Fund, LP Cogentrix Co-Investment Fund, LP [Member] Cogentrix Co-Investment Fund, LP Regulatory liabilities, deferred income, and other Regulatory liabilities, deferred income, and other Other Liabilities and Deferred Revenue, Noncurrent Additional amount by which credit facility can be increased Additional Amount By Which Credit Facility Can Be Increased Additional amount by which the credit facility can be increased. Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Common Stock, Shares, Issued Common Stock, Shares, Issued Measured on a recurring basis Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Abstract] Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization Product costs Cost of Goods and Service, Excluding Depreciation, Depletion, and Amortization Product and Service [Domain] Product and Service [Domain] Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Variable Interest Entity [Line Items] Variable Interest Entity [Line Items] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Impaired Long-Lived Assets Held and Used, Asset Name [Domain] Impaired Long-Lived Assets Held and Used, Asset Name [Domain] Private Equity Funds, US Private Equity Funds, US [Member] Natural gas transportation service Natural Gas, US Regulated [Member] Termination Date Trading Arrangement Termination Date Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value, Recurring and Nonrecurring [Table] Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived Business Combination, Recognized Asset Acquired, Identifiable Intangible Asset, Finite-Lived Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration] Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Other current liabilities Other current liabilities Other Liabilities, Current Total interest and penalties accrued as uncertain tax positions Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued Derivative assets Derivative Asset, Current Accrued Liabilities and Other Liabilities Accrued Liabilities, Current Entity Public Float Entity Public Float Fair Value as of Grant Date Award Grant Date Fair Value Gain on sale of certain assets (Note 3) Gain on sale of certain assets Gain on sale of certain assets (Note 3) Gain (Loss) on Disposition of Assets Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Operating and maintenance expenses Operating Costs and Expenses Arrangement Duration Trading Arrangement Duration Consolidation Items [Axis] Consolidation Items [Axis] Entity Address, Postal Zip Code Entity Address, Postal Zip Code Entity Registrant Name Entity Registrant Name Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Revenues Revenues Total revenues Revenues Gain on disposition of equity-method investments (Note 3) Equity Method Investment, Realized Gain (Loss) on Disposal Equity Method Investment, Realized Gain (Loss) on Disposal Equity earnings (losses) Equity (earnings) losses Income (Loss) from Equity Method Investments Income (Loss) from Equity Method Investments Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Environmental Remediation Contingency [Axis] Environmental Remediation Contingency [Axis] Brazos Permian II, LLC [Member] Brazos Permian II LLC [Member] Brazos Permian II LLC [Member] DJ Basin Acquisitions DJ Basin Acquisitions [Member] DJ Basin Acquisitions, comprised of Cureton Acquisition and RMM Acquisition Fair Value Assets and Liabilities Measured On Recurring Basis [Table Text Block] Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] All Award Types Award Type [Domain] Fair Value Measurements and Guarantees [Text Block] Fair Value Disclosures [Text Block] Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Subsidiary, Ownership Percentage, Noncontrolling Owner Subsidiary, Ownership Percentage, Noncontrolling Owner Lessor, Operating Lease, Payment to be Received Lessor, Operating Lease, Payment to be Received Contract with Customer, Liability - Beginning of Period Contract with Customer, Liability - End of Period Contract with Customer, Liability Contract with Customer, Liability Legal Entity [Axis] Legal Entity [Axis] Purchases of treasury stock Purchases of treasury stock Treasury Stock, Value, Acquired, Cost Method Cash and cash equivalents Cash and cash equivalents at beginning of year Cash and cash equivalents at end of period Cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation Overland Pass Pipeline Company LLC [Member] Overland Pass Pipeline Company LLC [Member] Overland Pass Pipeline Company LLC [Member] Non-NEOs Non-NEOs [Member] Equity Method Investment, Ownership Percentage Equity Method Investment, Ownership Percentage 4.55% Senior Unsecured Notes Due 2024 [Member] 4.55 Percent Senior Unsecured Notes Due 2024 [Member] 4.55% Senior Unsecured Notes Due 2024 [Member] Schedule of Debt Issuances Schedule of Debt [Table Text Block] 5.1 Percent Senior Unsecured Notes Due 2036 5.1 Percent Senior Unsecured Notes Due 2036 [Member] 5.1 Percent Senior Unsecured Notes Due 2036 Equity Method Investee, Name [Domain] Investment, Name [Domain] Investment, Name [Domain] Leases [Text Block] Lessee, Operating Leases [Text Block] Statistical Measurement [Axis] Statistical Measurement [Axis] Award Type Award Type [Axis] Lessor, Operating Lease, Payment to be Received, Remainder of Fiscal Year Lessor, Operating Lease, Payment to be Received, Remainder of Fiscal Year Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Retained deficit Retained Earnings (Accumulated Deficit) Retained Earnings (Accumulated Deficit) Central Hub Risk Central Hub Risk [Member] Central Hub Risk Maximum ratio of debt to EBITDA Maximum Ratio Of Debt To EBITDA Maximum Ratio Of Debt To EBITDA Product and Service [Axis] Product and Service [Axis] Certain South Mansfield Upstream Interests Certain South Mansfield Upstream Interests [Member] Certain South Mansfield Upstream Interests Gas Purchase Payable, Current Gas Purchase Payable, Current 5.8 Percent Senior Unsecured Notes Due 2054 5.8 Percent Senior Unsecured Notes Due 2054 [Member] 5.8 Percent Senior Unsecured Notes Due 2054 Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Common Stock Common Stock [Member] Operating Lease, Lease Income Operating Lease, Lease Income [Table Text Block] Long-Lived Assets Held-for-Sale, Name [Domain] Long-Lived Assets Held-for-Sale, Name [Domain] RMM Acquisition RMM Acquisition [Member] RMM Acquisition Series B Preferred Stock [Member] Series B Preferred Stock [Member] Momentum Acquisition [Member] Momentum Acquisition [Member] Momentum Acquisition Derivative Contract [Domain] Derivative Contract [Domain] Share Price Change Share Price Change Percentage increase (decrease) in the price of a single share of a number of saleable stocks of a company. Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Provision (Benefit) for Income Taxes (Textuals) [Abstract] Provision (Benefit) for Income Taxes (Textuals) [Abstract] ProvisionBenefitForIncomeTaxesTextualsAbstract Total liabilities and equity Total liabilities and equity Liabilities and Equity Intangible assets – net Intangible Asset, Including Goodwill, after Accumulated Amortization Employee Stock Option Share-Based Payment Arrangement, Option [Member] Contract With Customer, Asset [Line Items] Contract With Customer, Asset [Line Items] Contract With Customer, Asset Gas Gathering Assets In Mid Continent Region Gas Gathering Assets In Mid Continent Region [Member] Gas Gathering Assets In Mid Continent Region Asset Retirement Obligation, Current Asset Retirement Obligation, Current Noncontrolling interests in consolidated subsidiaries Equity, Attributable to Noncontrolling Interest Segments [Axis] Segments [Axis] Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Related Party [Domain] Related and Nonrelated Parties [Domain] Tabular List, Table Tabular List [Table Text Block] Reserve for rate refunds (Note 10) Increase (Decrease) In Reserve For Rate Refunds The increase (decrease) during the reporting period in the value of regulatory liabilities generally representing obligations to make refunds to customers for various reasons including overpayment. Other operating (income) expense – net Other operating (income) expense – net Other Operating Income (Expense), Net Name Awards Close in Time to MNPI Disclosures, Individual Name Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Debt Securities, Trading, and Equity Securities, FV-NI Debt Securities, Trading, and Equity Securities, FV-NI [Table Text Block] 5.00 Percent Senior Unsecured Notes Due 2029 5.00 Percent Senior Unsecured Notes Due 2029 [Member] 5.00 Percent Senior Unsecured Notes Due 2029 Property, plant, and equipment, net [Member] Property, Plant and Equipment [Member] Property, Plant and Equipment, Type [Domain] Long-Lived Asset, Class [Domain] Public Utilities, Inventory, Natural Gas Public Utilities, Inventory, Natural Gas [Member] 5.3 Percent Senior Unsecured Notes Due 2035 [Member] 5.3 Percent Senior Unsecured Notes Due 2035 [Member] 5.3 Percent Senior Unsecured Notes Due 2035 Preferred stock ($1 par value; 30 million shares authorized at September 30, 2026 and December 31, 2025; 35 thousand shares issued at September 30, 2026 and December 31, 2025) Preferred Stock, Value, Issued Adjustment to Compensation: Adjustment to Compensation [Axis] External Trust External Trust [Member] External Trust Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Extinguishment of Debt, Amount Extinguishment of Debt, Amount Natural Gas Purchased For Shrink [Member] Natural Gas Purchased For Shrink [Member] Natural Gas Purchased For Shrink Hedging Designation [Axis] Hedging Designation [Axis] Credit Facility [Axis] Credit Facility [Axis] Long-term debt Long-Term Debt and Lease Obligation Name Measure Name Pay vs Performance Disclosure [Line Items] Fair Value Hierarchy and NAV [Domain] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Other Operating Segment Other Operating Segment [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Other current assets and deferred charges Increase (Decrease) in Other Current Assets Capital in Excess of Par Value Capital in excess of par value [Member] Additional Paid-in Capital [Member] Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Goodwill, Impairment Loss Goodwill, Impairment Loss Lessor, Operating Lease, Payment to be Received, Year Five Lessor, Operating Lease, Payment to be Received, Year Five Name Trading Arrangement, Individual Name Company Selected Measure Amount Company Selected Measure Amount Depreciation, depletion, and amortization expenses Depreciation, depletion, and amortization Depreciation, Depletion and Amortization Depreciation, Depletion and Amortization Income (loss) from continuing operations Net Income (Loss) from Continuing Operations Available to Common Shareholders, Basic Schedule of Accounts, Notes, Loans and Financing Receivable [Table] Accounts and Financing Receivables [Table] Non-PEO NEO Non-PEO NEO [Member] Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Liabilities Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Liabilities Regulatory assets Increase (Decrease) in Other Regulatory Assets Award Timing Method Award Timing Method [Text Block] Other service Product and Service, Other [Member] Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect, Total Increase (decrease) in cash and cash equivalents Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Period Increase (Decrease), Including Exchange Rate Effect and Discontinued Operation Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress Lessor, Operating Lease, Payment to be Received, Year Two Lessor, Operating Lease, Payment to be Received, Year Two Members' Capital Members' Capital Net income Net Income (Loss) Attributable to Parent Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Balance Sheet Location [Axis] Location, Statement of Financial Position, Balance [Axis] Income (loss) from discontinued operations (Note 1) Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Customer Axis [Domain] Customer Axis [Domain] Customer Axis [Domain] Restatement Determination Date: Restatement Determination Date [Axis] Deferred Revenue, Refund Payments Deferred Revenue, Refund Payments Provision (benefit) for deferred income taxes Deferred Income Tax Expense Benefit From Continuing And Discontinued Operations The component of income tax expense for the period representing the increase (decrease) in the entity's deferred tax assets and liabilities pertaining to continuing and discontinued operations. Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment Revenues: Revenues [Abstract] Revenues [Abstract] Energy Commodities and Service Energy Commodities and Service [Member] Collateral Already Posted, Aggregate Fair Value Collateral Already Posted, Aggregate Fair Value Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Statistical Measurement [Domain] Statistical Measurement [Domain] Impaired Long-Lived Assets Held and Used by Type [Axis] Impaired Long-Lived Assets Held and Used by Type [Axis] Document Fiscal Year Focus Document Fiscal Year Focus Derivative Liability, Fair Value, Gross Asset Derivative Liability, Subject to Master Netting Arrangement, Asset Offset Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Business Combination, Acquisition-Related Cost, Expense Business Combination, Acquisition-Related Cost, Expense Contract With Customer, Liability [Line Items] Contract With Customer, Liability [Line Items] [Line Items] for Contract With Customer, Liability [Table] Common stock ($1 par value; 1,470 million shares authorized at September 30, 2026 and December 31, 2025; 1,290 million shares issued at September 30, 2026 and 1,261 million shares issued at December 31, 2025) Common Stock, Value, Issued Schedule of Long-term Debt Instruments [Table Text Block] Schedule of Long-Term Debt Instruments [Table Text Block] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Proceeds from (payments of) commercial paper – net Proceeds from (Repayments of) Commercial Paper Restatement Determination Date Restatement Determination Date Unrecorded Estimated Recoveries For Environmental Loss Contingencies Unrecorded Estimated Recoveries For Environmental Loss Contingencies Unrecorded amount of the estimated recovery through rates expected in the future that would reduce costs for environmental loss contingencies. Realized Gain (Loss) Realized Gain (Loss) [Member] Realized Gain (Loss) Inventory write-downs Inventory Write-down Provision for income taxes at federal statutory rate [Table Text Block] Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Advances from affiliate – net Increase Decrease In Advances From Affiliates The increase (decrease) during the reporting period in the amount owed by the reporting entity (during the current year or operating cycle) in the form of demand notes. Regulatory Liabilities, Noncurrent Regulatory Liability, Noncurrent Amendment Flag Amendment Flag Proceeds from disposition of equity-method investments (Note 3) Proceeds from Sale of Equity Method Investments Current liabilities: Liabilities, Current [Abstract] Liabilities, Current [Abstract] 3.9% Senior Unsecured Notes Due 2025 [Member] 3.9 Percent Senior Unsecured Notes Due 2025 [Member] 3.9% Senior Unsecured Notes Due 2025 [Member] Payments to Suppliers Payments to Suppliers Loss Contingencies [Table] Loss Contingencies [Table] Northeast JV [Member] Northeast JV [Member] Northeast JV [Member] Regulatory liabilities IncreaseDecreaseInOtherRegulatoryLiabilities The (increase) decrease during the reporting period in the value of other regulatory liabilities that are created when regulatory agencies permits public utilities to defer revenues to the balance sheet. Property, Plant, and Equipment, Lessor Asset under Operating Lease, before Accumulated Depreciation Property, Plant, and Equipment, Lessor Asset under Operating Lease, before Accumulated Depreciation Increase (Decrease) in Deferred Income Taxes Increase (Decrease) in Deferred Income Taxes Members' Equity [Abstract] Members' Equity [Abstract] Issuance of common stock as noncash acquisition consideration (Note 3) Stock Issued During Period, Value, Acquisitions Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Entity Address, State or Province Entity Address, State or Province PEO Total Compensation Amount PEO Total Compensation Amount Lessor, Operating Lease, Option to Extend Lessor, Operating Lease, Option to Extend Segment Reporting, Long-Lived Asset, Expenditure for Addition Segment Reporting, Long-Lived Asset, Expenditure for Addition Derivative, Notional Amount Derivative, Notional Amount Income Tax Contingency [Line Items] Income Tax Contingency [Line Items] Weighted Average Number of Shares Outstanding, Basic Weighted Average Number of Shares Outstanding, Basic Recovery of Direct Costs Recovery of Direct Costs Regulatory Assets, Noncurrent Regulatory Asset, Noncurrent Loss Contingencies [Line Items] Loss Contingencies [Line Items] Environmental Remediation Contingency [Domain] Environmental Remediation Contingency [Domain] Lessor, Operating Lease, Description [Abstract] Lessor, Operating Lease, Description [Abstract] Noncontrolling Interest in Joint Ventures Noncontrolling Interest in Joint Ventures Schedule of Cash Flow, Supplemental Disclosures Schedule of Cash Flow, Supplemental Disclosures [Table Text Block] West [Member] West [Member] -- None. No documentation exists for this element. -- ICFR Auditor Attestation Flag ICFR Auditor Attestation Flag Commercial paper Commercial paper, outstanding Commercial Paper Document Information [Line Items] Document Information [Line Items] Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Class of Stock [Axis] Class of Stock [Axis] Net income (loss) available to common stockholders Net Income (Loss) Available to Common Stockholders, Basic Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract] Additional Cash Flow Elements and Supplemental Cash Flow Information [Abstract] Receivable [Domain] Receivable [Domain] Credit facility, capacity Line of Credit Facility, Maximum Borrowing Capacity Long-Term Debt, Current Maturities Long-Term Debt, Current Maturities Gulf Coast Storage Acquisition Gulf Coast Storage Acquisition [Member] Gulf Coast Storage Acquisition Other investing income (loss) – net (Note 3) Other investing income (loss) - net Investment Income, Nonoperating Dispositions – net (Note 3) Payments To Retire Proceeds From Sale Of Property Plant And Equipment The net cash outflow or inflow from the retirement or sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale. Treasury stock, at cost (39 million shares at September 30, 2026 and December 31, 2025 of common stock) Treasury Stock, Value Noncontrolling Interests Noncontrolling Interest [Member] 5.65 Percent Senior Unsecured Notes Due 2033 5.65 Percent Senior Unsecured Notes Due 2033 [Member] 5.65 Percent Senior Unsecured Notes Due 2033 Member's Capital Member Units [Member] Cash provided (used) by changes in current assets and liabilities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Increase (Decrease) in Operating Capital [Abstract] 5.15 Percent Senior Unsecured Notes Due 2034 5.15 Percent Senior Unsecured Notes Due 2034 [Member] 5.15 Percent Senior Unsecured Notes Due 2034 Net cash provided (used) by investing activities Net cash provided (used) by investing activities Cash Provided by (Used in) Investing Activity, Including Discontinued Operation Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Debt Securities, Trading, and Equity Securities, FV-NI, Cost Debt Securities, Trading, and Equity Securities, FV-NI, Cost Commodity Derivative Contract Risk [Axis] Commodity Derivative Contract Risk [Axis] Commodity Derivative Contract Risk Costs and expenses: Costs and Expenses [Abstract] Costs and Expenses [Abstract] Security Exchange Name Security Exchange Name Impairment of equity-method investments Equity Method Investment, Other-than-Temporary Impairment Net increase (decrease) in equity Stockholders' Equity, Period Increase (Decrease) Interest Payable, Current Interest Payable, Current Comprehensive income (loss): Statement of Comprehensive Income [Abstract] Name Outstanding Recovery, Individual Name Derivative, Additional Notional Amount Additional Derivative Notional Amount Nominal or face amount used to calculate payment on derivatives for agreements added during the period. Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] 364-Day Credit Agreement 364-Day Credit Agreement [Member] 364-Day Credit Agreement State Deferred State and Local Income Tax Expense (Benefit) Interest Income and Interest Expense Disclosure Interest Income and Interest Expense Disclosure [Table Text Block] Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Status Of Gain (Loss) [Axis] Status Of Gain (Loss) [Axis] Status of Gain (Loss) Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Gain (Loss) Related to Litigation Settlement Gain (Loss) from Litigation Settlement Unrealized Unrealized Gain (Loss) on Derivatives Unrealized Gain (Loss) on Derivatives Rocky Mountain Midstream Holdings LLC [Member] Rocky Mountain Midstream Holdings LLC [Member] Rocky Mountain Midstream Holdings LLC [Member] Williams Companies Inc [Member] The Williams Companies, Inc. [Member] Williams Companies Inc [Member] -- None. No documentation exists for this element. -- Proceeds from sale of business (Note 3) Proceeds from Divestiture of Businesses, Net of Cash Divested Long-term debt Long-Term Debt, Gross Business Combination Achieved In Stages Preacquisition Working Interest In Acquiree Percentage Business Combination Achieved In Stages Preacquisition Working Interest In Acquiree Percentage Percentage of working interest in the acquiree held by the acquirer immediately before the acquisition date in a business combination. Allowance for equity funds used during construction (equity AFUDC) Increase (Decrease) in Allowance for Equity Funds Used During Construction Dec21 And Subsequent Quarters [Member] Dec21 And Subsequent Quarters [Member] Dec21 And Subsequent Quarters Compensation Amount Outstanding Recovery Compensation Amount Capitalized Contract Cost, Accumulated Amortization Capitalized Contract Cost, Amortization Individual: Individual [Axis] Business Combination, Voting Equity Interest Acquired, Percentage Business Combination, Voting Equity Interest Acquired, Percentage Weighted Average Number of Shares Outstanding, Diluted Weighted Average Number of Shares Outstanding, Diluted Letters Of Credit Under Certain Bilateral Bank Agreements [Member] Letters Of Credit Under Certain Bilateral Bank Agreements [Member] Letters of Credit Under Certain Bilateral Bank Agreements [Member] Accounts, Notes, Loans and Financing Receivable [Line Items] Accounts, Notes, Loans and Financing Receivable [Line Items] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Entity Emerging Growth Company Entity Emerging Growth Company Underlying Security Market Price Change Underlying Security Market Price Change, Percent Commercial paper [Member] Commercial Paper [Member] Commodity Derivatives [Text Block] Derivative Instruments and Hedging Activities Disclosure [Text Block] Derivative Liability, Fair Value, Gross Liability Derivative Liability, Subject to Master Netting Arrangement, before Offset Federal Deferred Federal Income Tax Expense (Benefit) Treasury Stock Treasury Stock, Common [Member] Credit facility, letters of credit outstanding Letters of Credit Outstanding, Amount Variable Lease, Income Variable Lease, Income Contributions and advances for construction costs Proceeds from Contribution in Aid of Construction, Investing Activity Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Investments Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Investments The amount of investments recognized as of the acquisition date. Gas & NGL Marketing Services Gas & NGL Marketing Services [Member] Gas & NGL Marketing Services Regulatory Liabilities Increase (Decrease) in Regulatory Liabilities Noncurrent The increase (decrease) during the reporting period in noncurrent regulatory liabilities. Noncurrent regulated liabilities are created when regulatory agency permits an entity to defer revenues to the balance sheet. All Executive Categories All Executive Categories [Member] Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Internal Customer Internal Customer [Member] Internal Customer Schedule of Subsidiary of Limited Liability Company or Limited Partnership [Table] Subsidiary of LLC or LP [Table] Wiltel Guarantee [Member] Wiltel Guarantee [Member] Guarantee provided in the event of nonpayment by previously owned communications subsidiary, Williams Communications Group (WilTel) Impairment of certain assets Tangible Asset Impairment Charges Tangible Asset Impairment Charges Potentially Responsible Party At Various Superfund And State Waste Disposal Sites Potentially Responsible Party At Various Superfund And State Waste Disposal Sites [Member] Potentially Responsible Party At Various Superfund And State Waste Disposal Sites 4% Senior Unsecured Notes Due 2025 [Member] 4 Percent Senior Unsecured Notes Due 2025 [Member] 4% Senior Unsecured Notes Due 2025 [Member] Debt Disclosure [Abstract] Debt Disclosure [Abstract] Segment Disclosures [Text Block] Segment Reporting [Text Block] Minimum [Member] Minimum [Member] Guarantees Guarantees, Fair Value Disclosure Fair value of investment Investments, Fair Value Disclosure Disaggregation of Revenue [Table Text Block] Disaggregation of Revenue [Table Text Block] Variable Interest Entities [Text Block] Variable Interest Entity Disclosure [Text Block] LIABILITIES AND EQUITY Liabilities [Abstract] Liabilities [Abstract] Income Statement Location [Axis] Location, Statement of Income, Balance [Axis] Income (Loss) from Continuing Operations, Per Diluted Share Income (Loss) from Continuing Operations, Per Diluted Share Income (Loss) from Continuing Operations, Per Basic Share Income (Loss) from Continuing Operations, Per Basic Share Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Quarters Ending Time [Axis] Quarters Ending Time [Axis] Quarters Ending Time [Axis] Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Financial Liabilities Fair Value Disclosure Financial Liabilities Fair Value Disclosure Business Combination, Achieved in Stages, Preacquisition Equity Interest in Acquiree, Percentage Business Combination, Achieved in Stages, Preacquisition Equity Interest in Acquiree, Percentage State deferred income tax rate change Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount Business Combination, Consideration Transferred, Liabilities Incurred Business Combination, Consideration Transferred, Liabilities Incurred Business Combination [Line Items] Business Combination [Line Items] Operating And Administrative Expenses Operating And Administrative Expenses Operating and Administrative Expenses Common Stock, Shares Authorized Common Stock, Shares Authorized Exercise Price Award Exercise Price Gain on remeasurement of equity-method investments (Note 3) Gain on remeasurement of equity-method investments Business Combination, Achieved in Stages, Preacquisition Equity Interest in Acquiree, Remeasurement, Gain Fair Value, Recurring [Member] Fair Value, Recurring [Member] Segment Reporting [Line Items] Segment Reporting [Line Items] Natural Gas Liquids Natural Gas Liquids (NGL) [Member] Contract with Customer, Asset, Reclassified to Receivable Contract with Customer, Asset, Reclassified to Receivable Stock Repurchase Program, Authorized Amount Share Repurchase Program, Authorized, Amount Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill, Less Noncontrolling Interest Business Combination, Recognized Asset Acquired to Liability Assumed, Excess (Less), and Goodwill, Less Noncontrolling Interest Document Quarterly Report Document Quarterly Report Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Remaining Performance Obligations [Member] Remaining Performance Obligations [Member] Remaining Performance Obligations [Member] Payments of long-term debt Payments on other financing obligations Repayments of Long-Term Debt Other Segment Income (Expenses) - Net Other Segment Income (Expenses) - Net Other Segment Income (Expenses) - Net Performance Obligation Source [Domain] Performance Obligation Source [Domain] [Domain] for Performance Obligation Source [Axis] Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Equity-method investments Equity Method Investments Equity Component [Domain] Equity Component [Domain] Measurement Input Type [Domain] Measurement Input Type [Domain] Variable rate Term Loan Due 2028 Variable rate Term Loan Due 2028 [Member] Variable rate Term Loan Due 2028 Adoption Date Trading Arrangement Adoption Date External Customer External Customer [Member] External Customer Disposal Group, Consideration Disposal Group, Including Discontinued Operation, Consideration Equity Securities Equity Securities, FV-NI, Current Title Trading Arrangement, Individual Title Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Other – net Proceeds from (Payment for) Other Financing Activity Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Derivative Nonmonetary Notional Amount Net Long Short Position Volume Derivative Nonmonetary Notional Amount Net Long Short Position Volume Derivative nonmonetary notional amount net long short position volume Derivative Receivables Derivative Receivables [Member] Derivative Receivables Schedule of Line of Credit Facilities [Table Text Block] Schedule of Line of Credit Facilities [Table Text Block] Other Service [Member] Other Service [Member] Other Service [Member] Business Combination [Domain] Business Combination [Domain] Letters of credit [Member] Letter of Credit [Member] Contingencies and Commitments [Text Block] Commitments and Contingencies Disclosure [Text Block] Customer Refund Liability, Current Customer Refund Liability, Current Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Operating Lease, Lease Income Operating Lease, Lease Income Weighted Average [Member] Weighted Average [Member] All Adjustments to Compensation All Adjustments to Compensation [Member] Corporate, Non-Segment Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] Other, including changes in noncurrent assets and liabilities Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity, Other Item Business Combination [Axis] Business Combination [Axis] Net cash provided (used) by operating activities Net cash provided (used) by operating activities Cash Provided by (Used in) Operating Activity, Including Discontinued Operation Performance Obligations Related To Contract Liabilities [Member] Performance Obligations Related To Contract Liabilities [Member] Performance Obligations Related To Contract Liabilities [Member] Stockholders’ equity: Equity, Attributable to Parent [Abstract] Income Statement [Abstract] Income Statement [Abstract] Document Transition Report Document Transition Report Intersegment Eliminations [Member] Intersegment Eliminations [Member] Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration] Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration] Lessor, Lease, Description [Line Items] Lessor, Lease, Description [Line Items] City Area Code City Area Code Business Combination, Consideration Transferred, Equity Interest, Type [Axis] Business Combination, Consideration Transferred, Equity Interest, Type [Axis] Gas Pipeline [Member] Gas Pipeline [Member] Document Information [Table] Document Information [Table] Name Forgone Recovery, Individual Name Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Other [Member] Other [Member] Other [Member] Entity [Domain] Entity [Domain] Accrued environmental loss liabilities Accrual for Environmental Loss Contingencies Preferred Stock, Shares Issued Preferred Stock, Shares Issued Fair Value Assets Measured On Nonrecurring Basis [Abstract] Fair Value Assets Measured On Nonrecurring Basis [Abstract] Fair Value Assets Measured On Nonrecurring Basis [Abstract] Sale of partial interest in consolidated subsidiary (Note 1) Noncontrolling Interest, Increase from Sale of Parent Equity Interest Contract with Customer, Duration [Domain] Contract with Customer, Duration [Domain] Current : Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Derivative Asset, Fair Value, Gross Liability Derivative Asset, Subject to Master Netting Arrangement, Liability Offset Measurement Basis [Axis] Measurement Basis [Axis] Swing Line Loan [Member] Swing Line Loan [Member] Swing line loan [Member] Maximum ratio of debt to EBITDA after acquisition Maximum Ratio Of Debt To EBITDA After Acquisition Maximum Ratio Of Debt To EBITDA permitted under covenants for the fiscal quarter and the two following fiscal quarters after an acquisition. Investments Investments Contract with Customer, Liability, Revenue Recognized Contract with Customer, Liability, Revenue Recognized Subsequent Event Type [Domain] Subsequent Event Type [Domain] Business Combination, Recognized Asset Acquired, Cash and Cash Equivalent Business Combination, Recognized Asset Acquired, Cash and Cash Equivalent Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Payments for debt issuance costs Payments of Debt Issuance Costs Entity Current Reporting Status Entity Current Reporting Status Net cash provided (used) by financing activities Net cash provided (used) by financing activities Cash Provided by (Used in) Financing Activity, Including Discontinued Operation 6.40 Percent Senior Unsecured Notes Due 2056 6.40 Percent Senior Unsecured Notes Due 2056 [Member] 6.40 Percent Senior Unsecured Notes Due 2056 Total Shareholder Return Amount Total Shareholder Return Amount Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share Credit Facility and Commercial Paper [Line Items] Line of Credit Facility [Line Items] Business Combination, Pro Forma Information [Table Text Block] Business Combination, Pro Forma Information [Table Text Block] Affiliate payables Increase (Decrease) in Accounts Payable, Related Parties Adjustments to reconcile to net cash provided (used) by operating activities: Adjustment to Reconcile Net Income to Cash Provided by (Used in) Operating Activity [Abstract] Loss Contingencies by Nature of Contingency [Axis] Loss Contingency Nature [Axis] Fair value of property, plant, and equipment Property, Plant, and Equipment, Fair Value Disclosure FINANCING ACTIVITIES: Cash Provided by (Used in) Financing Activity, Including Discontinued Operation [Abstract] Property, plant, and equipment – net Property, plant, and equipment – net Property, Plant, and Equipment, after Accumulated Depreciation, Depletion, and Amortization Additional Collateral, Aggregate Fair Value Additional Collateral, Aggregate Fair Value Income Tax Paid, State and Local, after Refund Received Income Tax Paid, State and Local, after Refund Received Financial Instruments [Domain] Financial Instruments [Domain] Other Comprehensive Income (Loss), Tax [Abstract] Other Comprehensive Income (Loss), Tax [Abstract] Derivative Asset Derivative Asset Cardinal Gas Services LLC [Member] Cardinal Gas Services LLC [Member] Cardinal Gas Services LLC [Member] Underlying Securities Award Underlying Securities Amount Less: Comprehensive income (loss) attributable to noncontrolling interests Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Fair Value [Member] Estimate of Fair Value Measurement [Member] Revenue Recognition [Text Block] Revenue from Contract with Customer [Text Block] Natural Gas Product Sales Natural Gas, Gathering, Transportation, Marketing and Processing [Member] Gulfstream Natural Gas System, LLC [Member] Gulfstream Natural Gas System, LLC [Member] Gulfstream Natural Gas System, LLC [Member] Preferred Stock Preferred Stock [Member] Other – net Payment for (Proceeds from) Other Investing Activity Inventories Increase (Decrease) in Inventories Increase (Decrease) in Inventories Segment Reporting [Table] Segment Reporting [Table] Income Tax Expense (Benefit), Continuing Operations [Abstract] Income Tax Expense (Benefit), Continuing Operations [Abstract] Lease, Cost [Table Text Block] Lease, Cost [Table Text Block] Other current assets and deferred charges Other current assets and deferred charges Other Assets, Current Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] All Trading Arrangements All Trading Arrangements [Member] Other Performance Measure, Amount Other Performance Measure, Amount Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Current Fiscal Year End Date Current Fiscal Year End Date Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Contract with Customer, Duration [Axis] Contract with Customer, Duration [Axis] Commitments for construction and acquisition of property, plant, and equipment Unrecorded Unconditional Purchase Obligation Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Common Stock, Dividends, Per Share, Declared Common Stock, Dividends, Per Share, Declared Entity File Number Entity File Number Stock-based compensation and related common stock issuances, net of tax Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture Dividends and distributions to noncontrolling interests Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Pro Forma [Member] Pro Forma [Member] Measure: Measure [Axis] Schedule of Variable Interest Entities [Table Text Block] Schedule of Variable Interest Entities [Table Text Block] Treasury Stock, Common, Shares Treasury Stock, Common, Shares Asset Retirement Obligations, Noncurrent Asset Retirement Obligations, Noncurrent Long-Lived Asset, Held-for-Sale, Type [Axis] Long-Lived Asset, Held-for-Sale, Type [Axis] Dispositions – net Payments for (Proceeds from) Removal Costs Statement, Equity Components [Axis] Equity Components [Axis] Affiliates Related Party Related Party [Member] Entity Interactive Data Current Entity Interactive Data Current Less: Net income (loss) attributable to noncontrolling interests Net Income (Loss) Attributable to Noncontrolling Interest Transcontinental Gas Pipe Line Company, LLC [Member] Transcontinental Gas Pipe Line Company, LLC [Member] Transcontinental Gas Pipe Line Company, LLC [Member] Cash contributions from parent Cash contributions from parent Proceeds from Contributions from Parent Former Operations [Member] Former Operations [Member] Former Operations. Entity Small Business Entity Small Business Comprehensive income (loss) attributable to The Williams Companies, Inc. Comprehensive Income (Loss), Net of Tax, Attributable to Parent Acquired Finite-lived Intangible Assets, Weighted Average Useful Life Intangible Asset, Finite-Lived, Acquired, Weighted-Average Amortization Period Partners' Capital Account, Return of Capital Partners' Capital Account, Return of Capital Trade accounts payable Increase (Decrease) in Accounts Payable, Trade Revenues Adjustments For Certain Risk Management Activities Costs Revenues Adjustments For Certain Risk Management Activities Costs Revenues Adjustments for Certain Risk Management Activities Costs MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Business Combination, Transition Related Costs Business Combination, Transition Related Costs This element represents transition-related costs incurred as the result of a business combination which costs have been expensed during the period. Regulatory assets, deferred charges, and other Other Assets, Noncurrent Other Assets, Noncurrent Document Type Document Type Purchases of businesses, net of cash acquired (Note 3) Payments to Acquire Businesses, Net of Cash Acquired Payments to Acquire Businesses, Net of Cash Acquired Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Impairment or write-off of certain assets (Note 8) Other Asset Impairment Charges Other Asset Impairment Charges Other Asset Impairment Charges Litigation Settlement, Amount Awarded from Other Party Litigation Settlement, Amount Awarded from Other Party Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Proceeds from long-term debt Proceeds from other financing obligations Proceeds from Issuance of Long-Term Debt Local Phone Number Local Phone Number Income (loss) before income taxes Net income (loss) Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Contingent liabilities and commitments (Note 10) Contingent liabilities and commitments Commitments and Contingencies Northwest Pipeline LLC [Member] Northwest Pipeline LLC [Member] Northwest Pipeline LLC [Member] Property, plant, and equipment Property, Plant, and Equipment, before Accumulated Depreciation, Depletion, and Amortization Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Pantheon Pantheon [Member] Pantheon Power LLC Joint Venture Income Tax Contingency [Table] Income Tax Contingency [Table] Executive Category: Executive Category [Axis] Lessor, Operating Lease, Renewal Term Lessor, Operating Lease, Renewal Term Receivable Type [Axis] Receivable Type [Axis] Other Comprehensive Income (Loss), Tax Other Comprehensive Income (Loss), Tax Contributions from noncontrolling interests Contributions From Noncontrolling Interests Noncontrolling interest, increase from contributions from noncontrolling interest holders. Liabilities and Equity [Abstract] Liabilities and Equity [Abstract] Lessor, Operating Lease, Payment to be Received, Year Four Lessor, Operating Lease, Payment to be Received, Year Four Inventories Inventory, Net Inventory, Net Commodity Derivative Contract Risk [Domain] Commodity Derivative Contract Risk [Domain] Commodity Derivative Contract Risk [Domain] Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Unrecorded Unconditional Purchase Obligation by Category of Item Purchased [Axis] Unrecorded Unconditional Purchase Obligation by Category of Item Purchased [Axis] Schedule Of Variable Interest Entities [Table] Variable Interest Entity [Table] Unrealized Gain (Loss) Unrealized Gain (Loss) [Member] Unrealized Gain (Loss) Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] PEO Name PEO Name Schedule of Extinguishment of Debt Schedule of Extinguishment of Debt [Table Text Block] Income Tax Paid, before Refund Received Income Tax Paid, before Refund Received Property, Plant and Equipment by Type [Axis] Long-Lived Asset, Class [Axis] Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Customer [Axis] Customer Axis [Axis] Customer Axis Entity Tax Identification Number Entity Tax Identification Number Derivative Instruments and Hedging Activities Disclosures [Table] Derivative Instruments and Hedging Activities Disclosures [Table] Asset Retirement Obligation Accretion Expense For Nonregulated Operations Asset Retirement Obligation Accretion Expense For Nonregulated Operations Asset Retirement Obligation Accretion Expense For Nonregulated Operations Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration] Fair Value, Concentration of Risk Fair Value, Concentration of Risk [Table Text Block] Less: Preferred stock dividends Preferred Stock Dividends, Income Statement Impact Operating Lease, Lease Income, Lease Payments Operating Lease, Lease Income, Lease Payments Business Combination, Achieved in Stages, Preacquisition Equity Interest in Acquiree, Remeasurement, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration] Business Combination, Achieved in Stages, Preacquisition Equity Interest in Acquiree, Remeasurement, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration] Accounts payable Increase (Decrease) in Accounts Payable Regulated Service [Member] Regulated Service [Member] Regulated Service [Member] Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] 5.30 Percent Senior Unsecured Notes Due 2028 5.30 Percent Senior Unsecured Notes Due 2028 [Member] 5.30 Percent Senior Unsecured Notes Due 2028 Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Measurement Frequency [Domain] Measurement Frequency [Domain] Debt Instrument [Axis] Debt Instrument [Axis] Business Combination, Recognized Liability Assumed, Other Liability, Noncurrent Business Combination, Recognized Liability Assumed, Other Liability, Noncurrent Amortization of stock-based awards Share-Based Payment Arrangement, Noncash Expense Regulatory Assets Increase (Decrease) in Regulatory Assets Noncurrent The increase (decrease) during the reporting period in the value of other noncurrent assets that are created when regulatory agencies permits public utilities to defer costs to the balance sheet. Income Tax Authority, Name [Domain] Income Tax Authority, Name [Domain] Disposal Group Name [Axis] Disposal Group Name [Axis] Net income (loss) available to common stockholders - Basic Earnings Per Share, Basic Measurement Input Type [Axis] Measurement Input Type [Axis] Total current assets Current assets Assets, Current Insider Trading Arrangements [Line Items] Oil and Gas, Purchased [Member] Oil and Gas, Purchased [Member] Long-Term Debt, Excluding Current Maturities Long-Term Debt, Excluding Current Maturities Property Plant And Equipment And Intangibles, Fair Value Disclosure Property Plant And Equipment And Intangibles, Fair Value Disclosure PropertyPlantAndEquipmentAndIntangibles,FairValueDisclosure Document Annual Report Document Annual Report Variable Interest Entity Disclosures [Abstract] Variable Interest Entity Disclosures [Abstract] -- None. No documentation exists for this element. -- Accounts Receivable, after Allowance for Credit Loss, Current Accounts Receivable, after Allowance for Credit Loss, Current Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Contract With Customer, Liability [Table] Contract With Customer, Liability [Table] Contract with Customer, Liability [Table] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Income Tax Authority, Name [Axis] Income Tax Authority, Name [Axis] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Description of Business and Basis of Presentation [Text Block] Organization, Consolidation and Presentation of Financial Statements Disclosure and Significant Accounting Policies [Text Block] Cover [Abstract] Cover [Abstract] Documents Incorporated by Reference [Text Block] Documents Incorporated by Reference [Text Block] Short-Term Debt, Weighted Average Interest Rate, at Point in Time Short-Term Debt, Weighted Average Interest Rate, at Point in Time Equity Awards Adjustments Equity Awards Adjustments [Member] Electric Generation Equipment Electric Generation Equipment [Member] Interest Income, Other Interest Income, Other Lessor, Operating Lease, Payment to be Received, Maturity Lessor, Operating Lease, Payment to be Received, Maturity [Table Text Block] Unrecorded Unconditional Purchase Obligation Percent Of Production Unrecorded Unconditional Purchase Obligation Percent Of Production Unrecorded obligation to transfer funds in future for fixed or minimum percent of production of product and service at fixed or minimum price. Contract With Customer Accounts Receivable [Table Text Block] Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block] Other income (expense) – net Other Nonoperating Income (Expense) Northeast G & P [Member] Northeast G & P [Member] -- None. No documentation exists for this element. -- Total Stockholders' Equity Parent [Member] Equity: Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Accrual for Environmental Loss Contingencies, Gross Accrual for Environmental Loss Contingencies, Gross General and administrative expenses General and Administrative Expense General and Administrative Expense Ownership Type [Domain] Ownership Type [Domain] Ownership Type [Domain] Preferred Stock, Shares Authorized Preferred Stock, Shares Authorized Receivables, Net, Current Receivables, Net, Current Hedging Designation [Domain] Hedging Designation [Domain] Class of Stock [Domain] Class of Stock [Domain] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Other Commitment Other Commitment Aggregate Available Trading Arrangement, Securities Aggregate Available Amount 5.75 Percent Senior Unsecured Notes Due 2056 5.75 Percent Senior Unsecured Notes Due 2056 [Member] 5.75 Percent Senior Unsecured Notes Due 2056 Business Combination, Consideration Transferred, Equity Interest, Type [Domain] Business Combination, Consideration Transferred, Equity Interest, Type [Domain] Provision (Benefit) for Income Taxes [Text Block] Income Tax Disclosure [Text Block] Accounts payable Accounts payable Accounts payable Accounts Payable, Current Noncontrolling interest resulting from acquisition (Note 3) Noncontrolling Interest, Increase from Business Combination Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location [Table Text Block] Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Modified EBITDA Earnings Loss Modified EBITDA Modified EBITDA Earnings Loss Amount of our segment operating performance measure, calculated as Net income (loss) before Provision (benefit) for income taxes; Interest incurred, net of interest capitalized; Equity earnings (losses); Impairment of equity-method investments; Other investing income (loss) – net; Impairment of goodwill; Depreciation and amortization expense; Accretion expense associated with asset retirement obligations for nonregulated operations. This measure is further adjusted to include our proportionate share (based on ownership interest) of Modified EBITDA from our equity-method investments calculated consistently with the definition described above. Business Combination, Consideration Transferred Business Combination, Consideration Transferred Entity Filer Category Entity Filer Category Gain (Loss) on Derivative Instruments, Net, Pretax Gain (Loss) on Derivative Instruments, Net, Pretax Variable Interest Entity Ownership Percentage Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage Business Combination Step Acquisition Working Interest In Acquiree After Acquisition Percentage Business Combination Step Acquisition Working Interest In Acquiree After Acquisition Percentage Percentage of working interest in the acquiree held by the acquirer immediately after the acquisition date in a business combination. Distributions from equity-method investees Proceeds from Equity Method Investment, Distribution Not Designated as Hedging Instrument [Member] Not Designated as Hedging Instrument [Member] Transco's annual funding commitment for ARO Other Commitment, to be Paid, Year One Crowheart Acquisition Crowheart Acquisition [Member] Crowheart Acquisition Net income (loss) Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Cash distributions to parent Cash distributions to parent Payments of Distributions to Affiliates Current assets: Assets, Current [Abstract] Assets, Current [Abstract] Derivative Liability Derivative Liability Derivative Liability Business Combination, Pro Forma Information, Pro Forma Revenue Business Combination, Pro Forma Information, Pro Forma Revenue Entity Address, Address Line One Entity Address, Address Line One 4.625 Percent Senior Unsecured Notes Due 2030 [Member] 4.625 Percent Senior Unsecured Notes Due 2030 [Member] 4.625 Percent Senior Unsecured Notes Due 2030 Less: Provision (benefit) for income taxes Less: Provision (benefit) for income taxes Income Tax Expense (Benefit) Washington State Climate Commitment Act Washington State Climate Commitment Act [Member] Washington State Climate Commitment Act Loss Contingency, Nature [Domain] Loss Contingency, Nature [Domain] Accounts and Financing Receivable, after Allowance for Credit Loss, Current Accounts and Financing Receivable, after Allowance for Credit Loss, Current Variable Interest Entity, Primary Beneficiary [Member] Variable Interest Entity, Primary Beneficiary [Member] Changes in related accounts payable and accrued liabilities Increase Decrease In Accounts Payable And Accrued Liabilities Related To Capital Expenditures Incurred But Not Yet Paid The increase / decrease during the reporting period in future cash outflows to pay for purchases of fixed assets that have occurred. Contract with Customer, Asset, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress Contract with Customer, Asset, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress Statement [Table] Statement [Table] Regulatory Liability, Current Regulatory Liability, Current Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] Other Financing Obligations Other Financing Obligations [Member] Other Financing Obligations Derivative Instruments and Hedging Activities Disclosures [Line Items] Derivative Instruments and Hedging Activities Disclosures [Line Items] Contract with Customer, Asset and Liability [Table Text Block] Contract with Customer, Contract Asset, Contract Liability, and Receivable [Table Text Block] Derivative Asset, Fair Value, Gross Asset Derivative Asset, Subject to Master Netting Arrangement, before Offset Discovery Producer Services LLC [Member] Discovery Producer Services LLC [Member] Discovery Producer Services LLC [Member] Issuances and Retirements [Abstract] Debt Instruments [Abstract] Investments Fair Value Inputs Investments Fair Value Inputs Investments Fair Value Inputs Federal Current Federal Tax Expense (Benefit) Derivative Instruments and Hedging Activities Disclosure [Abstract]