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Segment Disclosures Recon from Segment to Consolidated - Revenues, Modified EBITDA, and Significant Expenses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment revenues [Line Items]      
Revenues $ 10,503 $ 10,907 $ 10,965
Other financial information:      
Gain (Loss) on Disposition of Business 0 129 0
Proportional Modified EBITDA Equity Method Investments (909) (939) (979)
Modified EBITDA 6,656 8,013 6,075
Gain (Loss) Related to Litigation Settlement 0 534 0
Depreciation, Depletion and Amortization (2,219) (2,071) (2,009)
Income (Loss) from Equity Method Investments 560 589 637
Other investing income (loss) - net 343 108 16
Interest Expense, Nonoperating (1,364) (1,236) (1,147)
Asset Retirement Obligation Accretion Expense For Nonregulated Operations (81) (59) (51)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 2,986 4,405 2,542
Energy Related Derivative | Not Designated as Hedging Instrument [Member] | Cost of Sales      
Other financial information:      
Unrealized Gain (Loss) on Derivatives (6) (43) 47
Service [Member]      
Segment revenues [Line Items]      
Revenues 7,628 7,026 6,536
NonRegulated Service Commodity Consideration [Member]      
Segment revenues [Line Items]      
Revenues 134 146 260
Product [Member]      
Segment revenues [Line Items]      
Revenues 2,991 2,779 4,556
Energy Commodities and Service      
Segment revenues [Line Items]      
Revenues (250) 956 (387)
Operating Segments [Member] | Transmission And Gulf Of America [Member]      
Segment revenues [Line Items]      
Revenues 4,628 4,150 4,047
Other financial information:      
Product Costs And Net Realized Processing Commodity Expenses (329) (259) (425)
Operating And Administrative Expenses [1] (1,104) (1,034) (906)
Recovery of Direct Costs [2] (250) (241) (254)
Other Segment Income (Expenses) - Net [3] 155 118 19
Gain (Loss) on Disposition of Business [4]   129  
Proportional Modified EBITDA Equity Method Investments 173 205 193
Modified EBITDA 3,273 3,068 2,674
Operating Segments [Member] | Transmission And Gulf Of America [Member] | Energy Related Derivative | Not Designated as Hedging Instrument [Member] | Cost of Sales      
Other financial information:      
Unrealized Gain (Loss) on Derivatives 0 0 0
Operating Segments [Member] | Transmission And Gulf Of America [Member] | Service [Member]      
Segment revenues [Line Items]      
Revenues 4,246 3,858 3,579
Operating Segments [Member] | Transmission And Gulf Of America [Member] | Service [Member] | External Customer      
Segment revenues [Line Items]      
Revenues 4,157 3,766 3,461
Operating Segments [Member] | Transmission And Gulf Of America [Member] | Service [Member] | Internal Customer      
Segment revenues [Line Items]      
Revenues 89 92 118
Operating Segments [Member] | Transmission And Gulf Of America [Member] | NonRegulated Service Commodity Consideration [Member]      
Segment revenues [Line Items]      
Revenues 54 38 64
Operating Segments [Member] | Transmission And Gulf Of America [Member] | Product [Member]      
Segment revenues [Line Items]      
Revenues 328 252 404
Operating Segments [Member] | Transmission And Gulf Of America [Member] | Product [Member] | External Customer      
Segment revenues [Line Items]      
Revenues 144 146 228
Operating Segments [Member] | Transmission And Gulf Of America [Member] | Product [Member] | Internal Customer      
Segment revenues [Line Items]      
Revenues 184 106 176
Operating Segments [Member] | Transmission And Gulf Of America [Member] | Energy Commodities and Service      
Segment revenues [Line Items]      
Revenues [5] 0 2 0
Operating Segments [Member] | Transmission And Gulf Of America [Member] | Energy Commodities and Service | Realized Gain (Loss)      
Segment revenues [Line Items]      
Revenues 0 2 0
Operating Segments [Member] | Transmission And Gulf Of America [Member] | Energy Commodities and Service | Unrealized Gain (Loss)      
Segment revenues [Line Items]      
Revenues 0 0 0
Operating Segments [Member] | Northeast G And P [Member]      
Segment revenues [Line Items]      
Revenues 2,025 2,033 1,802
Other financial information:      
Product Costs And Net Realized Processing Commodity Expenses (88) (125) (138)
Operating And Administrative Expenses [1] (441) (424) (384)
Recovery of Direct Costs [2] (143) (132) (132)
Other Segment Income (Expenses) - Net [3] 3 (10) (6)
Gain (Loss) on Disposition of Business [4]   0  
Proportional Modified EBITDA Equity Method Investments 602 574 654
Modified EBITDA 1,958 1,916 1,796
Operating Segments [Member] | Northeast G And P [Member] | Energy Related Derivative | Not Designated as Hedging Instrument [Member] | Cost of Sales      
Other financial information:      
Unrealized Gain (Loss) on Derivatives 0 0 0
Operating Segments [Member] | Northeast G And P [Member] | Service [Member]      
Segment revenues [Line Items]      
Revenues 1,913 1,896 1,654
Operating Segments [Member] | Northeast G And P [Member] | Service [Member] | External Customer      
Segment revenues [Line Items]      
Revenues 1,900 1,868 1,613
Operating Segments [Member] | Northeast G And P [Member] | Service [Member] | Internal Customer      
Segment revenues [Line Items]      
Revenues 13 28 41
Operating Segments [Member] | Northeast G And P [Member] | NonRegulated Service Commodity Consideration [Member]      
Segment revenues [Line Items]      
Revenues 2 5 14
Operating Segments [Member] | Northeast G And P [Member] | Product [Member]      
Segment revenues [Line Items]      
Revenues 110 132 134
Operating Segments [Member] | Northeast G And P [Member] | Product [Member] | External Customer      
Segment revenues [Line Items]      
Revenues 24 34 28
Operating Segments [Member] | Northeast G And P [Member] | Product [Member] | Internal Customer      
Segment revenues [Line Items]      
Revenues 86 98 106
Operating Segments [Member] | Northeast G And P [Member] | Energy Commodities and Service      
Segment revenues [Line Items]      
Revenues [5] 0 0 0
Operating Segments [Member] | Northeast G And P [Member] | Energy Commodities and Service | Realized Gain (Loss)      
Segment revenues [Line Items]      
Revenues 0 0 0
Operating Segments [Member] | Northeast G And P [Member] | Energy Commodities and Service | Unrealized Gain (Loss)      
Segment revenues [Line Items]      
Revenues 0 0 0
Operating Segments [Member] | West [Member]      
Segment revenues [Line Items]      
Revenues 2,669 2,135 2,561
Other financial information:      
Product Costs And Net Realized Processing Commodity Expenses (844) (517) (918)
Operating And Administrative Expenses [1] (591) (502) (507)
Recovery of Direct Costs [2] (49) (37) (43)
Other Segment Income (Expenses) - Net [3] (5) (3) (14)
Gain (Loss) on Disposition of Business [4]   0  
Proportional Modified EBITDA Equity Method Investments 132 162 132
Modified EBITDA 1,312 1,238 1,211
Operating Segments [Member] | West [Member] | Energy Related Derivative | Not Designated as Hedging Instrument [Member] | Cost of Sales      
Other financial information:      
Unrealized Gain (Loss) on Derivatives 0 0 0
Operating Segments [Member] | West [Member] | Service [Member]      
Segment revenues [Line Items]      
Revenues 1,718 1,502 1,542
Operating Segments [Member] | West [Member] | Service [Member] | External Customer      
Segment revenues [Line Items]      
Revenues 1,558 1,376 1,443
Operating Segments [Member] | West [Member] | Service [Member] | Internal Customer      
Segment revenues [Line Items]      
Revenues 160 126 99
Operating Segments [Member] | West [Member] | NonRegulated Service Commodity Consideration [Member]      
Segment revenues [Line Items]      
Revenues 78 103 182
Operating Segments [Member] | West [Member] | Product [Member]      
Segment revenues [Line Items]      
Revenues 869 441 841
Operating Segments [Member] | West [Member] | Product [Member] | External Customer      
Segment revenues [Line Items]      
Revenues 178 80 145
Operating Segments [Member] | West [Member] | Product [Member] | Internal Customer      
Segment revenues [Line Items]      
Revenues 691 361 696
Operating Segments [Member] | West [Member] | Energy Commodities and Service      
Segment revenues [Line Items]      
Revenues [5] 4 89 (4)
Operating Segments [Member] | West [Member] | Energy Commodities and Service | Realized Gain (Loss)      
Segment revenues [Line Items]      
Revenues 4 89 (4)
Operating Segments [Member] | West [Member] | Energy Commodities and Service | Unrealized Gain (Loss)      
Segment revenues [Line Items]      
Revenues 0 0 0
Operating Segments [Member] | Gas & NGL Marketing Services      
Segment revenues [Line Items]      
Revenues [6] 1,789 2,878 3,233
Other financial information:      
Product Costs And Net Realized Processing Commodity Expenses (1,799) (1,786) (3,228)
Operating And Administrative Expenses [1] (108) (98) (96)
Recovery of Direct Costs [2] 0 0 0
Other Segment Income (Expenses) - Net [3] 0 (1) 4
Gain (Loss) on Disposition of Business [4]   0  
Proportional Modified EBITDA Equity Method Investments 0 0 0
Modified EBITDA (124) 950 (40)
Operating Segments [Member] | Gas & NGL Marketing Services | Energy Related Derivative | Not Designated as Hedging Instrument [Member] | Cost of Sales      
Other financial information:      
Unrealized Gain (Loss) on Derivatives (6) (43) 47
Operating Segments [Member] | Gas & NGL Marketing Services | Service [Member]      
Segment revenues [Line Items]      
Revenues [6] 0 1 3
Operating Segments [Member] | Gas & NGL Marketing Services | Service [Member] | External Customer      
Segment revenues [Line Items]      
Revenues [6] 0 1 3
Operating Segments [Member] | Gas & NGL Marketing Services | Service [Member] | Internal Customer      
Segment revenues [Line Items]      
Revenues [6] 0 0 0
Operating Segments [Member] | Gas & NGL Marketing Services | NonRegulated Service Commodity Consideration [Member]      
Segment revenues [Line Items]      
Revenues [6] 0 0 0
Operating Segments [Member] | Gas & NGL Marketing Services | Product [Member]      
Segment revenues [Line Items]      
Revenues [6] 2,052 2,060 3,534
Operating Segments [Member] | Gas & NGL Marketing Services | Product [Member] | External Customer      
Segment revenues [Line Items]      
Revenues [6] 2,500 2,382 4,052
Operating Segments [Member] | Gas & NGL Marketing Services | Product [Member] | Internal Customer      
Segment revenues [Line Items]      
Revenues [6] (448) (322) (518)
Operating Segments [Member] | Gas & NGL Marketing Services | Energy Commodities and Service      
Segment revenues [Line Items]      
Revenues [5],[6] (263) 817 (304)
Operating Segments [Member] | Gas & NGL Marketing Services | Energy Commodities and Service | Realized Gain (Loss)      
Segment revenues [Line Items]      
Revenues [6] 72 115 17
Operating Segments [Member] | Gas & NGL Marketing Services | Energy Commodities and Service | Unrealized Gain (Loss)      
Segment revenues [Line Items]      
Revenues [6] (335) 702 (321)
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment      
Segment revenues [Line Items]      
Revenues 11,111 11,196 11,643
Other financial information:      
Modified EBITDA 6,419 7,172 5,641
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Service [Member]      
Segment revenues [Line Items]      
Revenues 7,877 7,257 6,778
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Service [Member] | External Customer      
Segment revenues [Line Items]      
Revenues 7,615 7,011 6,520
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Service [Member] | Internal Customer      
Segment revenues [Line Items]      
Revenues 262 246 258
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | NonRegulated Service Commodity Consideration [Member]      
Segment revenues [Line Items]      
Revenues 134 146 260
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Product [Member]      
Segment revenues [Line Items]      
Revenues 3,359 2,885 4,913
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Product [Member] | External Customer      
Segment revenues [Line Items]      
Revenues 2,846 2,642 4,453
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Product [Member] | Internal Customer      
Segment revenues [Line Items]      
Revenues 513 243 460
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Energy Commodities and Service      
Segment revenues [Line Items]      
Revenues [5] (259) 908 (308)
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Energy Commodities and Service | Realized Gain (Loss)      
Segment revenues [Line Items]      
Revenues 76 206 13
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Energy Commodities and Service | Unrealized Gain (Loss)      
Segment revenues [Line Items]      
Revenues (335) 702 (321)
Corporate, Non-Segment | Other Operating Segment      
Segment revenues [Line Items]      
Revenues 444 506 651
Other financial information:      
Modified EBITDA 237 307 434
Corporate, Non-Segment | Other Operating Segment | Energy Commodities and Service      
Segment revenues [Line Items]      
Revenues (26) 1 25
Corporate, Non-Segment | Other Operating Segment | Other [Member]      
Segment revenues [Line Items]      
Revenues 470 505 626
Intersegment Eliminations [Member]      
Segment revenues [Line Items]      
Revenues $ (1,052) (795) $ (1,329)
Segment Reporting, Reconciling Item, Excluding Corporate Nonsegment      
Other financial information:      
Gain (Loss) Related to Litigation Settlement [7]   $ 534  
[1] Segment operating and administrative expenses primarily include payroll, maintenance and operating costs and taxes, and general and administrative expenses, including acquisition and transition-related expenses. It also includes project execution, information technology, finance and accounting, real estate and aviation, central engineering services, safety and operational discipline, supply chain and digital transformation, corporate strategic development, human resources, legal and government affairs, and executive and audit support services costs which are centrally managed and allocated to segments.
[2] Recoverable power, transportation and storage costs are charges incurred which are reimbursable pursuant to FERC stipulations or customer contracts.
[3] Other segment income (expenses) primarily includes equity AFUDC and regulatory credits and charges related to Williams’ regulated operations.
[4] Gain on sale of business reflects a gain recognized on the sale of certain liquids pipelines in the Gulf Coast region in September 2023 (see Note 3 – Acquisitions and Divestitures).
[5] Williams records transactions that qualify as commodity derivatives at fair value with changes in fair value recognized in earnings in the period of change and characterized as unrealized gains or losses. Gains and losses from commodity derivatives held for energy trading purposes are presented on a net basis in revenue.
[6] As Williams is acting as agent for natural gas marketing customers or engages in energy trading activities, the resulting revenues are presented net of the related costs of those activities.
[7] Net gain from Energy Transfer litigation judgment resulted from a favorable ruling in November 2023 (see Note 1 – General, Description of Business, Basis of Presentation, and Summary of Significant Accounting Policies).