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Segment Disclosures Recon from Segment to Consolidated - Revenues, Modified EBITDA, and Significant Expenses (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
USD ($)
Mar. 31, 2026
USD ($)
Dec. 31, 2025
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
Reportable_segment
Jun. 30, 2025
USD ($)
Segment Reporting [Line Items]            
Revenues $ 3,053     $ 2,781 $ 6,083 $ 5,829
Other financial information:            
Proportional Modified EBITDA Equity Method Investments (249)     (231) (508) (467)
Gain on sale of certain assets (Note 3) 12     0 194 0
Depreciation, Depletion and Amortization (592)     (605) (1,176) (1,190)
Income (Loss) from Equity Method Investments 159     142 320 297
Other investing income (loss) - net 134     4 158 12
Interest expense (371)     (350) (747) (699)
Asset Retirement Obligation Accretion Expense For Nonregulated Operations (24)     (24) (47) (48)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 1,136     757 $ 2,292 1,679
Number of Reportable Segments | Reportable_segment         4  
Energy Related Derivative | Not Designated as Hedging Instrument [Member] | Income Statement Location [Axis]: us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization            
Other financial information:            
Unrealized Gain (Loss) on Derivatives 1     12 $ 1 2
Energy Related Derivative | Not Designated as Hedging Instrument [Member] | Income Statement Location [Axis]: us-gaap:Revenues            
Other financial information:            
Unrealized Gain (Loss) on Derivatives 141     24 (84) 2
Service [Member]            
Segment Reporting [Line Items]            
Revenues 2,152     2,041 4,358 4,044
NonRegulated Service Commodity Consideration [Member]            
Segment Reporting [Line Items]            
Revenues 45     47 91 96
Product [Member]            
Segment Reporting [Line Items]            
Revenues 762     657 1,899 1,715
Energy Commodities and Service            
Segment Reporting [Line Items]            
Revenues 94     36 (265) (26)
Other Operating Segment | Certain South Mansfield Upstream Interests            
Other financial information:            
Gain on sale of certain assets (Note 3) 12 $ 182        
Operating Segments [Member] | Transmission, Power & Gulf [Member]            
Segment Reporting [Line Items]            
Revenues 1,385     1,312 2,826 2,584
Other financial information:            
Product Costs And Net Realized Processing Commodity Expenses (135)     (119) (271) (242)
Operating And Administrative Expenses [1] (300)     (286) (582) (556)
Recovery of Direct Costs [2] (53)     (55) (125) (125)
Other Segment Income (Expenses) - Net [3] 26     2 48 15
Proportional Modified EBITDA Equity Method Investments 36     37 73 73
Modified EBITDA 959     891 1,969 1,749
Operating Segments [Member] | Transmission, Power & Gulf [Member] | Energy Related Derivative | Not Designated as Hedging Instrument [Member] | Income Statement Location [Axis]: us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization            
Other financial information:            
Unrealized Gain (Loss) on Derivatives 0     0 0 0
Operating Segments [Member] | Transmission, Power & Gulf [Member] | Service [Member]            
Segment Reporting [Line Items]            
Revenues 1,237     1,176 2,524 2,311
Operating Segments [Member] | Transmission, Power & Gulf [Member] | Service [Member] | External Customer            
Segment Reporting [Line Items]            
Revenues 1,214     1,150 2,476 2,263
Operating Segments [Member] | Transmission, Power & Gulf [Member] | Service [Member] | Internal Customer            
Segment Reporting [Line Items]            
Revenues 23     26 48 48
Operating Segments [Member] | Transmission, Power & Gulf [Member] | NonRegulated Service Commodity Consideration [Member]            
Segment Reporting [Line Items]            
Revenues 23     28 49 51
Operating Segments [Member] | Transmission, Power & Gulf [Member] | Product [Member]            
Segment Reporting [Line Items]            
Revenues 129     108 258 223
Operating Segments [Member] | Transmission, Power & Gulf [Member] | Product [Member] | External Customer            
Segment Reporting [Line Items]            
Revenues 25     31 61 57
Operating Segments [Member] | Transmission, Power & Gulf [Member] | Product [Member] | Internal Customer            
Segment Reporting [Line Items]            
Revenues 104     77 197 166
Operating Segments [Member] | Transmission, Power & Gulf [Member] | Energy Commodities and Service            
Segment Reporting [Line Items]            
Revenues [4] (4)     0 (5) (1)
Operating Segments [Member] | Transmission, Power & Gulf [Member] | Energy Commodities and Service | Realized Gain (Loss)            
Segment Reporting [Line Items]            
Revenues (4)     0 (5) (1)
Operating Segments [Member] | Transmission, Power & Gulf [Member] | Energy Commodities and Service | Unrealized Gain (Loss)            
Segment Reporting [Line Items]            
Revenues 0     0 0 0
Operating Segments [Member] | Northeast G & P [Member]            
Segment Reporting [Line Items]            
Revenues 547     541 1,090 1,096
Other financial information:            
Product Costs And Net Realized Processing Commodity Expenses (18)     (38) (57) (90)
Operating And Administrative Expenses [1] (109)     (113) (212) (219)
Recovery of Direct Costs [2] (47)     (41) (97) (83)
Other Segment Income (Expenses) - Net [3] (1)     (2) 4 (2)
Proportional Modified EBITDA Equity Method Investments 168     154 336 313
Modified EBITDA 540     501 1,064 1,015
Operating Segments [Member] | Northeast G & P [Member] | Energy Related Derivative | Not Designated as Hedging Instrument [Member] | Income Statement Location [Axis]: us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization            
Other financial information:            
Unrealized Gain (Loss) on Derivatives 0     0 0 0
Operating Segments [Member] | Northeast G & P [Member] | Service [Member]            
Segment Reporting [Line Items]            
Revenues 529     497 1,033 994
Operating Segments [Member] | Northeast G & P [Member] | Service [Member] | External Customer            
Segment Reporting [Line Items]            
Revenues 526     494 1,026 987
Operating Segments [Member] | Northeast G & P [Member] | Service [Member] | Internal Customer            
Segment Reporting [Line Items]            
Revenues 3     3 7 7
Operating Segments [Member] | Northeast G & P [Member] | NonRegulated Service Commodity Consideration [Member]            
Segment Reporting [Line Items]            
Revenues 1     0 1 1
Operating Segments [Member] | Northeast G & P [Member] | Product [Member]            
Segment Reporting [Line Items]            
Revenues 17     44 56 101
Operating Segments [Member] | Northeast G & P [Member] | Product [Member] | External Customer            
Segment Reporting [Line Items]            
Revenues 7     17 22 35
Operating Segments [Member] | Northeast G & P [Member] | Product [Member] | Internal Customer            
Segment Reporting [Line Items]            
Revenues 10     27 34 66
Operating Segments [Member] | Northeast G & P [Member] | Energy Commodities and Service            
Segment Reporting [Line Items]            
Revenues [4] 0     0 0 0
Operating Segments [Member] | Northeast G & P [Member] | Energy Commodities and Service | Realized Gain (Loss)            
Segment Reporting [Line Items]            
Revenues 0     0 0 0
Operating Segments [Member] | Northeast G & P [Member] | Energy Commodities and Service | Unrealized Gain (Loss)            
Segment Reporting [Line Items]            
Revenues 0     0 0 0
Operating Segments [Member] | West [Member]            
Segment Reporting [Line Items]            
Revenues 724     676 1,479 1,401
Other financial information:            
Product Costs And Net Realized Processing Commodity Expenses (219)     (201) (438) (455)
Operating And Administrative Expenses [1] (166)     (150) (315) (302)
Recovery of Direct Costs [2] (16)     (15) (36) (29)
Other Segment Income (Expenses) - Net [3] 1     (1) 5 10
Proportional Modified EBITDA Equity Method Investments 35     32 71 70
Modified EBITDA 359     341 766 695
Operating Segments [Member] | West [Member] | Energy Related Derivative | Not Designated as Hedging Instrument [Member] | Income Statement Location [Axis]: us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization            
Other financial information:            
Unrealized Gain (Loss) on Derivatives 0     0 0 0
Operating Segments [Member] | West [Member] | Service [Member]            
Segment Reporting [Line Items]            
Revenues 476     446 982 884
Operating Segments [Member] | West [Member] | Service [Member] | External Customer            
Segment Reporting [Line Items]            
Revenues 408     393 848 786
Operating Segments [Member] | West [Member] | Service [Member] | Internal Customer            
Segment Reporting [Line Items]            
Revenues 68     53 134 98
Operating Segments [Member] | West [Member] | NonRegulated Service Commodity Consideration [Member]            
Segment Reporting [Line Items]            
Revenues 21     19 41 44
Operating Segments [Member] | West [Member] | Product [Member]            
Segment Reporting [Line Items]            
Revenues 228     210 458 474
Operating Segments [Member] | West [Member] | Product [Member] | External Customer            
Segment Reporting [Line Items]            
Revenues 30     31 71 71
Operating Segments [Member] | West [Member] | Product [Member] | Internal Customer            
Segment Reporting [Line Items]            
Revenues 198     179 387 403
Operating Segments [Member] | West [Member] | Energy Commodities and Service            
Segment Reporting [Line Items]            
Revenues [4] (1)     1 (2) (1)
Operating Segments [Member] | West [Member] | Energy Commodities and Service | Realized Gain (Loss)            
Segment Reporting [Line Items]            
Revenues (1)     1 (2) (1)
Operating Segments [Member] | West [Member] | Energy Commodities and Service | Unrealized Gain (Loss)            
Segment Reporting [Line Items]            
Revenues 0     0 0 0
Operating Segments [Member] | Gas & NGL Marketing Services            
Segment Reporting [Line Items]            
Revenues [5] 638     389 1,172 1,100
Other financial information:            
Product Costs And Net Realized Processing Commodity Expenses (507)     (421) (985) (934)
Operating And Administrative Expenses [1] (18)     (19) (52) (58)
Recovery of Direct Costs [2] 0     0 0 0
Other Segment Income (Expenses) - Net [3] (1)     1 (1) 1
Proportional Modified EBITDA Equity Method Investments 10     8 28 11
Modified EBITDA 123     (30) 163 122
Operating Segments [Member] | Gas & NGL Marketing Services | Energy Related Derivative | Not Designated as Hedging Instrument [Member] | Income Statement Location [Axis]: us-gaap:CostOfGoodsAndServiceExcludingDepreciationDepletionAndAmortization            
Other financial information:            
Unrealized Gain (Loss) on Derivatives 1     12 1 2
Operating Segments [Member] | Gas & NGL Marketing Services | Service [Member]            
Segment Reporting [Line Items]            
Revenues [5] 0     0 0 0
Operating Segments [Member] | Gas & NGL Marketing Services | Service [Member] | External Customer            
Segment Reporting [Line Items]            
Revenues [5] 0     0 0 0
Operating Segments [Member] | Gas & NGL Marketing Services | Service [Member] | Internal Customer            
Segment Reporting [Line Items]            
Revenues [5] 0     0 0 0
Operating Segments [Member] | Gas & NGL Marketing Services | NonRegulated Service Commodity Consideration [Member]            
Segment Reporting [Line Items]            
Revenues [5] 0     0 0 0
Operating Segments [Member] | Gas & NGL Marketing Services | Product [Member]            
Segment Reporting [Line Items]            
Revenues [5] 548     403 1,401 1,142
Operating Segments [Member] | Gas & NGL Marketing Services | Product [Member] | External Customer            
Segment Reporting [Line Items]            
Revenues [5] 623     529 1,618 1,461
Operating Segments [Member] | Gas & NGL Marketing Services | Product [Member] | Internal Customer            
Segment Reporting [Line Items]            
Revenues [5] (75)     (126) (217) (319)
Operating Segments [Member] | Gas & NGL Marketing Services | Energy Commodities and Service            
Segment Reporting [Line Items]            
Revenues [4],[5] 90     (14) (229) (42)
Operating Segments [Member] | Gas & NGL Marketing Services | Energy Commodities and Service | Realized Gain (Loss)            
Segment Reporting [Line Items]            
Revenues [5] (29)     2 (156) (33)
Operating Segments [Member] | Gas & NGL Marketing Services | Energy Commodities and Service | Unrealized Gain (Loss)            
Segment Reporting [Line Items]            
Revenues [5] 119     (16) (73) (9)
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment            
Segment Reporting [Line Items]            
Revenues 3,294     2,918 6,567 6,181
Other financial information:            
Modified EBITDA 1,981     1,703 3,962 3,581
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Service [Member]            
Segment Reporting [Line Items]            
Revenues 2,242     2,119 4,539 4,189
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Service [Member] | External Customer            
Segment Reporting [Line Items]            
Revenues 2,148     2,037 4,350 4,036
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Service [Member] | Internal Customer            
Segment Reporting [Line Items]            
Revenues 94     82 189 153
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | NonRegulated Service Commodity Consideration [Member]            
Segment Reporting [Line Items]            
Revenues 45     47 91 96
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Product [Member]            
Segment Reporting [Line Items]            
Revenues 922     765 2,173 1,940
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Product [Member] | External Customer            
Segment Reporting [Line Items]            
Revenues 685     608 1,772 1,624
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Product [Member] | Internal Customer            
Segment Reporting [Line Items]            
Revenues 237     157 401 316
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Energy Commodities and Service            
Segment Reporting [Line Items]            
Revenues [4] 85     (13) (236) (44)
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Energy Commodities and Service | Realized Gain (Loss)            
Segment Reporting [Line Items]            
Revenues (34)     3 (163) (35)
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Energy Commodities and Service | Unrealized Gain (Loss)            
Segment Reporting [Line Items]            
Revenues 119     (16) (73) (9)
Corporate, Non-Segment | Other Operating Segment            
Segment Reporting [Line Items]            
Revenues 151     190 260 318
Other financial information:            
Modified EBITDA 86     118 136 193
Corporate, Non-Segment | Other Operating Segment | Certain South Mansfield Upstream Interests            
Other financial information:            
Gain on sale of certain assets (Note 3) 12       194  
Intersegment Eliminations [Member]            
Segment Reporting [Line Items]            
Revenues (392)     (327) (744) (670)
Williams Companies Inc [Member] | West [Member] | Income Statement Location [Axis]: us-gaap:OtherAssetImpairmentCharges | Level 2 [Member]            
Other financial information:            
Impairment of Long-Lived Assets to be Disposed of     $ 176      
Transcontinental Gas Pipe Line Company, LLC [Member]            
Segment Reporting [Line Items]            
Revenues 804     791 1,651 1,561
Other financial information:            
Depreciation, Depletion and Amortization (146)     (166) (290) (315)
Interest expense (83)     (81) (169) (162)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 367     314 $ 751 635
Number of Reportable Segments | Reportable_segment         1  
Northwest Pipeline LLC [Member]            
Segment Reporting [Line Items]            
Revenues 118     113 $ 238 224
Other financial information:            
Depreciation, Depletion and Amortization (31)     (30) (61) (59)
Interest expense (9)     (7) (17) (14)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest $ 47     $ 45 $ 99 $ 91
Number of Reportable Segments | Reportable_segment         1  
[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) - net primarily includes equity AFUDC and regulatory credits and charges related to Williams’ regulated operations.
[4] 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.
[5] 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.