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Segment Disclosures Recon from Segment to Consolidated - Revenues, Modified EBITDA, and Significant Expenses (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment revenues [Line Items]        
Revenues $ 2,923 $ 2,653 $ 8,752 $ 7,760
Other financial information:        
Proportional Modified EBITDA Equity Method Investments (250) (227) (717) (693)
Depreciation, Depletion and Amortization (564) (566) (1,754) (1,654)
Income (Loss) from Equity Method Investments 152 147 449 431
Other investing income (loss) - net 19 290 31 332
Interest expense (372) (338) (1,071) (1,026)
Asset Retirement Obligation Accretion Expense For Nonregulated Operations (23) (17) (71) (56)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 929 968 2,608 2,378
Energy Related Derivative | Not Designated as Hedging Instrument [Member] | Cost of Sales        
Other financial information:        
Unrealized Gain (Loss) on Derivatives 2 1 4 (3)
Service [Member]        
Segment revenues [Line Items]        
Revenues 2,121 1,911 6,165 5,653
NonRegulated Service Commodity Consideration [Member]        
Segment revenues [Line Items]        
Revenues 45 34 141 82
Product [Member]        
Segment revenues [Line Items]        
Revenues 701 703 2,416 2,158
Energy Commodities and Service        
Segment revenues [Line Items]        
Revenues 56 5 30 (133)
Operating Segments [Member] | Transmission, Power & Gulf [Member]        
Segment revenues [Line Items]        
Revenues 1,392 1,170 3,976 3,357
Other financial information:        
Product Costs And Net Realized Processing Commodity Expenses (139) (87) (381) (188)
Operating And Administrative Expenses [1] (290) (294) (846) (809)
Recovery of Direct Costs [2] (64) (65) (189) (191)
Other Segment Income (Expenses) - Net [3] 37 46 52 143
Proportional Modified EBITDA Equity Method Investments 37 41 110 136
Modified EBITDA 973 811 2,722 2,448
Operating Segments [Member] | Transmission, Power & Gulf [Member] | Energy Related Derivative | Not Designated as Hedging Instrument [Member] | Cost of Sales        
Other financial information:        
Unrealized Gain (Loss) on Derivatives 0 0 0 0
Operating Segments [Member] | Transmission, Power & Gulf [Member] | Service [Member]        
Segment revenues [Line Items]        
Revenues 1,237 1,072 3,548 3,144
Operating Segments [Member] | Transmission, Power & Gulf [Member] | Service [Member] | External Customer        
Segment revenues [Line Items]        
Revenues 1,213 1,049 3,476 3,077
Operating Segments [Member] | Transmission, Power & Gulf [Member] | Service [Member] | Internal Customer        
Segment revenues [Line Items]        
Revenues 24 23 72 67
Operating Segments [Member] | Transmission, Power & Gulf [Member] | NonRegulated Service Commodity Consideration [Member]        
Segment revenues [Line Items]        
Revenues 24 14 75 28
Operating Segments [Member] | Transmission, Power & Gulf [Member] | Product [Member]        
Segment revenues [Line Items]        
Revenues 130 84 353 185
Operating Segments [Member] | Transmission, Power & Gulf [Member] | Product [Member] | External Customer        
Segment revenues [Line Items]        
Revenues 42 30 99 85
Operating Segments [Member] | Transmission, Power & Gulf [Member] | Product [Member] | Internal Customer        
Segment revenues [Line Items]        
Revenues 88 54 254 100
Operating Segments [Member] | Transmission, Power & Gulf [Member] | Energy Commodities and Service        
Segment revenues [Line Items]        
Revenues [4] 1 0 0 0
Operating Segments [Member] | Transmission, Power & Gulf [Member] | Energy Commodities and Service | Realized Gain (Loss)        
Segment revenues [Line Items]        
Revenues 1 0 0 0
Operating Segments [Member] | Transmission, Power & Gulf [Member] | Energy Commodities and Service | Unrealized Gain (Loss)        
Segment revenues [Line Items]        
Revenues 0 0 0 0
Operating Segments [Member] | Northeast G & P [Member]        
Segment revenues [Line Items]        
Revenues 530 502 1,626 1,494
Other financial information:        
Product Costs And Net Realized Processing Commodity Expenses (25) (19) (115) (56)
Operating And Administrative Expenses [1] (114) (120) (333) (336)
Recovery of Direct Costs [2] (42) (35) (125) (101)
Other Segment Income (Expenses) - Net [3] (5) (1) (7) 1
Proportional Modified EBITDA Equity Method Investments 161 149 474 459
Modified EBITDA 505 476 1,520 1,461
Operating Segments [Member] | Northeast G & 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 0
Operating Segments [Member] | Northeast G & P [Member] | Service [Member]        
Segment revenues [Line Items]        
Revenues 499 475 1,493 1,419
Operating Segments [Member] | Northeast G & P [Member] | Service [Member] | External Customer        
Segment revenues [Line Items]        
Revenues 495 473 1,482 1,410
Operating Segments [Member] | Northeast G & P [Member] | Service [Member] | Internal Customer        
Segment revenues [Line Items]        
Revenues 4 2 11 9
Operating Segments [Member] | Northeast G & P [Member] | NonRegulated Service Commodity Consideration [Member]        
Segment revenues [Line Items]        
Revenues 0 1 1 1
Operating Segments [Member] | Northeast G & P [Member] | Product [Member]        
Segment revenues [Line Items]        
Revenues 31 26 132 74
Operating Segments [Member] | Northeast G & P [Member] | Product [Member] | External Customer        
Segment revenues [Line Items]        
Revenues 7 8 42 15
Operating Segments [Member] | Northeast G & P [Member] | Product [Member] | Internal Customer        
Segment revenues [Line Items]        
Revenues 24 18 90 59
Operating Segments [Member] | Northeast G & P [Member] | Energy Commodities and Service        
Segment revenues [Line Items]        
Revenues [4] 0 0 0 0
Operating Segments [Member] | Northeast G & P [Member] | Energy Commodities and Service | Realized Gain (Loss)        
Segment revenues [Line Items]        
Revenues 0 0 0 0
Operating Segments [Member] | Northeast G & P [Member] | Energy Commodities and Service | Unrealized Gain (Loss)        
Segment revenues [Line Items]        
Revenues 0 0 0 0
Operating Segments [Member] | West [Member]        
Segment revenues [Line Items]        
Revenues 712 663 2,113 1,985
Other financial information:        
Product Costs And Net Realized Processing Commodity Expenses (211) (210) (666) (636)
Operating And Administrative Expenses [1] (150) (157) (452) (444)
Recovery of Direct Costs [2] (17) (13) (46) (36)
Other Segment Income (Expenses) - Net [3] (28) 5 (18) 3
Proportional Modified EBITDA Equity Method Investments 36 35 106 96
Modified EBITDA 342 323 1,037 968
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 0
Operating Segments [Member] | West [Member] | Service [Member]        
Segment revenues [Line Items]        
Revenues 470 426 1,354 1,270
Operating Segments [Member] | West [Member] | Service [Member] | External Customer        
Segment revenues [Line Items]        
Revenues 409 385 1,195 1,154
Operating Segments [Member] | West [Member] | Service [Member] | Internal Customer        
Segment revenues [Line Items]        
Revenues 61 41 159 116
Operating Segments [Member] | West [Member] | NonRegulated Service Commodity Consideration [Member]        
Segment revenues [Line Items]        
Revenues 21 19 65 53
Operating Segments [Member] | West [Member] | Product [Member]        
Segment revenues [Line Items]        
Revenues 219 218 693 657
Operating Segments [Member] | West [Member] | Product [Member] | External Customer        
Segment revenues [Line Items]        
Revenues 38 47 109 153
Operating Segments [Member] | West [Member] | Product [Member] | Internal Customer        
Segment revenues [Line Items]        
Revenues 181 171 584 504
Operating Segments [Member] | West [Member] | Energy Commodities and Service        
Segment revenues [Line Items]        
Revenues [4] 2 0 1 5
Operating Segments [Member] | West [Member] | Energy Commodities and Service | Realized Gain (Loss)        
Segment revenues [Line Items]        
Revenues 2 0 1 5
Operating Segments [Member] | West [Member] | Energy Commodities and Service | Unrealized Gain (Loss)        
Segment revenues [Line Items]        
Revenues 0 0 0 0
Operating Segments [Member] | Gas & NGL Marketing Services        
Segment revenues [Line Items]        
Revenues [5] 448 482 1,548 1,343
Other financial information:        
Product Costs And Net Realized Processing Commodity Expenses (398) (450) (1,332) (1,269)
Operating And Administrative Expenses [1] (14) (22) (72) (85)
Recovery of Direct Costs [2] 0 0 0 0
Other Segment Income (Expenses) - Net [3] 0 0 1 0
Proportional Modified EBITDA Equity Method Investments 16 0 27 0
Modified EBITDA 54 11 176 (14)
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 2 1 4 (3)
Operating Segments [Member] | Gas & NGL Marketing Services | Service [Member]        
Segment revenues [Line Items]        
Revenues [5] 0 0 0 0
Operating Segments [Member] | Gas & NGL Marketing Services | Service [Member] | External Customer        
Segment revenues [Line Items]        
Revenues [5] 0 0 0 0
Operating Segments [Member] | Gas & NGL Marketing Services | Service [Member] | Internal Customer        
Segment revenues [Line Items]        
Revenues [5] 0 0 0 0
Operating Segments [Member] | Gas & NGL Marketing Services | NonRegulated Service Commodity Consideration [Member]        
Segment revenues [Line Items]        
Revenues [5] 0 0 0 0
Operating Segments [Member] | Gas & NGL Marketing Services | Product [Member]        
Segment revenues [Line Items]        
Revenues [5] 415 481 1,557 1,491
Operating Segments [Member] | Gas & NGL Marketing Services | Product [Member] | External Customer        
Segment revenues [Line Items]        
Revenues [5] 576 585 2,037 1,800
Operating Segments [Member] | Gas & NGL Marketing Services | Product [Member] | Internal Customer        
Segment revenues [Line Items]        
Revenues [5] (161) (104) (480) (309)
Operating Segments [Member] | Gas & NGL Marketing Services | Energy Commodities and Service        
Segment revenues [Line Items]        
Revenues [4],[5] 33 1 (9) (148)
Operating Segments [Member] | Gas & NGL Marketing Services | Energy Commodities and Service | Realized Gain (Loss)        
Segment revenues [Line Items]        
Revenues [5] (11) (8) (44) 40
Operating Segments [Member] | Gas & NGL Marketing Services | Energy Commodities and Service | Unrealized Gain (Loss)        
Segment revenues [Line Items]        
Revenues [5] 44 9 35 (188)
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment        
Segment revenues [Line Items]        
Revenues 3,082 2,817 9,263 8,179
Other financial information:        
Modified EBITDA 1,874 1,621 5,455 4,863
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Service [Member]        
Segment revenues [Line Items]        
Revenues 2,206 1,973 6,395 5,833
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Service [Member] | External Customer        
Segment revenues [Line Items]        
Revenues 2,117 1,907 6,153 5,641
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Service [Member] | Internal Customer        
Segment revenues [Line Items]        
Revenues 89 66 242 192
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | NonRegulated Service Commodity Consideration [Member]        
Segment revenues [Line Items]        
Revenues 45 34 141 82
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Product [Member]        
Segment revenues [Line Items]        
Revenues 795 809 2,735 2,407
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Product [Member] | External Customer        
Segment revenues [Line Items]        
Revenues 663 670 2,287 2,053
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Product [Member] | Internal Customer        
Segment revenues [Line Items]        
Revenues 132 139 448 354
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Energy Commodities and Service        
Segment revenues [Line Items]        
Revenues [4] 36 1 (8) (143)
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Energy Commodities and Service | Realized Gain (Loss)        
Segment revenues [Line Items]        
Revenues (8) (8) (43) 45
Operating Segments [Member] | Reportable Segment, Aggregation before Other Operating Segment | Energy Commodities and Service | Unrealized Gain (Loss)        
Segment revenues [Line Items]        
Revenues 44 9 35 (188)
Corporate, Non-Segment | Other Operating Segment        
Segment revenues [Line Items]        
Revenues 160 103 478 311
Other financial information:        
Modified EBITDA 93 58 286 181
Intersegment Eliminations [Member]        
Segment revenues [Line Items]        
Revenues $ (319) $ (267) $ (989) $ (730)
[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, as well as the write-off of certain compression assets in the West segment in the third quarter of 2025 (Note 8 – Fair Value Measurements and Guarantees).
[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.