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Segment Disclosures (Tables) | 6 Months Ended
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Jun. 30, 2026
Segment Reporting [Abstract] |
Reconciliation of revenue from segment to consolidated [Table Text Block] | The following tables present revenues, Modified EBITDA, significant expenses, and certain segment assets measures:
| Transmission, Power & Gulf |  | Northeast G&P |  | West |  | Gas & NGL Marketing Services (1) |  | Total
| (Millions)
Three Months Ended June 30, 2026 |  |  |  |  |  |  |  |
Segment revenues: |  |  |  |  |  |  |  |  |
Service revenues |  |  |  |  |  |  |  |  |
External | $ | 1,214 |  |  | $ | 526 |  |  | $ | 408 |  |  | $ | — |  |  | $ | 2,148 |
Internal | 23 |  |  | 3 |  |  | 68 |  |  | — |  |  | 94 |
Total service revenues | 1,237 |  |  | 529 |  |  | 476 |  |  | — |  |  | 2,242 |
Total service revenues – commodity consideration | 23 |  |  | 1 |  |  | 21 |  |  | — |  |  | 45 |
Product sales |  |  |  |  |  |  |  |  |
External | 25 |  |  | 7 |  |  | 30 |  |  | 623 |  |  | 685 |
Internal | 104 |  |  | 10 |  |  | 198 |  |  | (75) |  |  | 237 |
Total product sales | 129 |  |  | 17 |  |  | 228 |  |  | 548 |  |  | 922 |
Net gain (loss) from commodity derivatives |  |  |  |  |  |  |  |  |
Realized | (4) |  |  | — |  |  | (1) |  |  | (29) |  |  | (34) |
Unrealized | — |  |  | — |  |  | — |  |  | 119 |  |  | 119 |
Total net gain (loss) from commodity derivatives (2) | (4) |  |  | — |  |  | (1) |  |  | 90 |  |  | 85 |
Total revenues of reportable segments | $ | 1,385 |  |  | $ | 547 |  |  | $ | 724 |  |  | $ | 638 |  |  | $ | 3,294 |
Segment costs and expenses and Proportional Modified EBITDA of equity-method investments: |  |  |  |  |  |  |  |  |
Product costs and net realized processing commodity expenses | (135) |  |  | (18) |  |  | (219) |  |  | (507) |  |  |
Net unrealized gain (loss) from commodity derivatives within Net processing commodity expenses | — |  |  | — |  |  | — |  |  | 1 |  |  |
Operating and administrative expenses (3) | (300) |  |  | (109) |  |  | (166) |  |  | (18) |  |  |
Recoverable power, transportation, and storage costs (4) | (53) |  |  | (47) |  |  | (16) |  |  | — |  |  |
Other segment income (expenses) - net (5) | 26 |  |  | (1) |  |  | 1 |  |  | (1) |  |  |
Proportional Modified EBITDA of equity-method investments | 36 |  |  | 168 |  |  | 35 |  |  | 10 |  |  |
Total Modified EBITDA of reportable segments | $ | 959 |  |  | $ | 540 |  |  | $ | 359 |  |  | $ | 123 |  |  | $ | 1,981 |
Reconciliation of Modified EBITDA: |  |  |  |  |  |  |  |  |
Contributions from upstream operations, corporate, and other business activities |  | 86 |
Gain on sale of certain upstream assets (Note 3) |  | 12 |
Depreciation, depletion, and amortization expenses |  | (592) |
Equity earnings (losses) |  | 159 |
Other investing income (loss) - net (Note 3) |  | 134 |
Interest expense |  | (371) |
Accretion expense associated with AROs for nonregulated operations |  | (24) |
Proportional Modified EBITDA of equity-method investments |  | (249) |
Income (loss) before income taxes |  | $ | 1,136 |
Additions to long-lived segment assets | $ | 1,556 |  |  | $ | 20 |  |  | $ | 42 |  |  | $ | 1 |  |  | $ | 1,619 |
| Transmission, Power & Gulf |  | Northeast G&P |  | West |  | Gas & NGL Marketing Services (1) |  | Total
| (Millions)
Three Months Ended June 30, 2025 |  |  |  |  |  |  |  |
Segment revenues: |  |  |  |  |  |  |  |  |
Service revenues |  |  |  |  |  |  |  |  |
External | $ | 1,150 |  |  | $ | 494 |  |  | $ | 393 |  |  | $ | — |  |  | $ | 2,037 |
Internal | 26 |  |  | 3 |  |  | 53 |  |  | — |  |  | 82 |
Total service revenues | 1,176 |  |  | 497 |  |  | 446 |  |  | — |  |  | 2,119 |
Total service revenues – commodity consideration | 28 |  |  | — |  |  | 19 |  |  | — |  |  | 47 |
Product sales |  |  |  |  |  |  |  |  |
External | 31 |  |  | 17 |  |  | 31 |  |  | 529 |  |  | 608 |
Internal | 77 |  |  | 27 |  |  | 179 |  |  | (126) |  |  | 157 |
Total product sales | 108 |  |  | 44 |  |  | 210 |  |  | 403 |  |  | 765 |
Net gain (loss) from commodity derivatives |  |  |  |  |  |  |  |  |
Realized | — |  |  | — |  |  | 1 |  |  | 2 |  |  | 3 |
Unrealized | — |  |  | — |  |  | — |  |  | (16) |  |  | (16) |
Total net gain (loss) from commodity derivatives (2) | — |  |  | — |  |  | 1 |  |  | (14) |  |  | (13) |
Total revenues of reportable segments | $ | 1,312 |  |  | $ | 541 |  |  | $ | 676 |  |  | $ | 389 |  |  | $ | 2,918 |
Segment costs and expenses and Proportional Modified EBITDA of equity-method investments: |  |  |  |  |  |  |  |  |
Product costs and net realized processing commodity expenses | (119) |  |  | (38) |  |  | (201) |  |  | (421) |  |  |
Net unrealized gain (loss) from commodity derivatives within Net processing commodity expenses | — |  |  | — |  |  | — |  |  | 12 |  |  |
Operating and administrative expenses (3) | (286) |  |  | (113) |  |  | (150) |  |  | (19) |  |  |
Recoverable power, transportation, and storage costs (4) | (55) |  |  | (41) |  |  | (15) |  |  | — |  |  |
Other segment income (expenses) - net (5) | 2 |  |  | (2) |  |  | (1) |  |  | 1 |  |  |
Proportional Modified EBITDA of equity-method investments | 37 |  |  | 154 |  |  | 32 |  |  | 8 |  |  |
Total Modified EBITDA of reportable segments | $ | 891 |  |  | $ | 501 |  |  | $ | 341 |  |  | $ | (30) |  |  | $ | 1,703 |
Reconciliation of Modified EBITDA: |  |  |  |  |  |  |  |  |
Contributions from upstream operations, corporate, and other business activities |  | 118 |
Depreciation, depletion, and amortization expenses |  | (605) |
Equity earnings (losses) |  | 142 |
Other investing income (loss) - net |  | 4 |
Interest expense |  | (350) |
Accretion expense associated with AROs for nonregulated operations |  | (24) |
Proportional Modified EBITDA of equity-method investments |  | (231) |
Income (loss) before income taxes |  | $ | 757 |
Additions to long-lived segment assets | $ | 725 |  |  | $ | 54 |  |  | $ | 238 |  |  | $ | 1 |  |  | $ | 1,018 |
| Transmission, Power & Gulf |  | Northeast G&P |  | West |  | Gas & NGL Marketing Services (1) |  | Total
| (Millions)
Six Months Ended June 30, 2026 |  |  |  |  |  |  |  |
Segment revenues: |  |  |  |  |  |  |  |  |
Service revenues |  |  |  |  |  |  |  |  |
External | $ | 2,476 |  |  | $ | 1,026 |  |  | $ | 848 |  |  | $ | — |  |  | $ | 4,350 |
Internal | 48 |  |  | 7 |  |  | 134 |  |  | — |  |  | 189 |
Total service revenues | 2,524 |  |  | 1,033 |  |  | 982 |  |  | — |  |  | 4,539 |
Total service revenues – commodity consideration | 49 |  |  | 1 |  |  | 41 |  |  | — |  |  | 91 |
Product sales |  |  |  |  |  |  |  |  |
External | 61 |  |  | 22 |  |  | 71 |  |  | 1,618 |  |  | 1,772 |
Internal | 197 |  |  | 34 |  |  | 387 |  |  | (217) |  |  | 401 |
Total product sales | 258 |  |  | 56 |  |  | 458 |  |  | 1,401 |  |  | 2,173 |
Net gain (loss) from commodity derivatives |  |  |  |  |  |  |  |  |
Realized | (5) |  |  | — |  |  | (2) |  |  | (156) |  |  | (163) |
Unrealized | — |  |  | — |  |  | — |  |  | (73) |  |  | (73) |
Total net gain (loss) from commodity derivatives (2) | (5) |  |  | — |  |  | (2) |  |  | (229) |  |  | (236) |
Total revenues of reportable segments | $ | 2,826 |  |  | $ | 1,090 |  |  | $ | 1,479 |  |  | $ | 1,172 |  |  | $ | 6,567 |
Segment costs and expenses and Proportional Modified EBITDA of equity-method investments: |  |  |  |  |  |  |  |  |
Product costs and net realized processing commodity expenses | (271) |  |  | (57) |  |  | (438) |  |  | (985) |  |  |
Net unrealized gain (loss) from commodity derivatives within Net processing commodity expenses | — |  |  | — |  |  | — |  |  | 1 |  |  |
Operating and administrative expenses (3) | (582) |  |  | (212) |  |  | (315) |  |  | (52) |  |  |
Recoverable power, transportation, and storage costs (4) | (125) |  |  | (97) |  |  | (36) |  |  | — |  |  |
Other segment income (expenses) - net (5) | 48 |  |  | 4 |  |  | 5 |  |  | (1) |  |  |
Proportional Modified EBITDA of equity-method investments | 73 |  |  | 336 |  |  | 71 |  |  | 28 |  |  |
Total Modified EBITDA of reportable segments | $ | 1,969 |  |  | $ | 1,064 |  |  | $ | 766 |  |  | $ | 163 |  |  | $ | 3,962 |
Reconciliation of Modified EBITDA: |  |  |  |  |  |  |  |  |
Contributions from upstream operations, corporate, and other business activities |  | 136 |
Gain on sale of certain upstream assets (Note 3) |  | 194 |
Depreciation, depletion, and amortization expenses |  | (1,176) |
Equity earnings (losses) |  | 320 |
Other investing income (loss) - net (Note 3) |  | 158 |
Interest expense |  | (747) |
Accretion expense associated with AROs for nonregulated operations |  | (47) |
Proportional Modified EBITDA of equity-method investments |  | (508) |
Income (loss) before income taxes |  | $ | 2,292 |
Additions to long-lived segment assets | $ | 2,986 |  |  | $ | 43 |  |  | $ | 108 |  |  | $ | 1 |  |  | $ | 3,138 |
| Transmission, Power & Gulf |  | Northeast G&P |  | West |  | Gas & NGL Marketing Services (1) |  | Total
| (Millions)
Six Months Ended June 30, 2025 |  |  |  |  |  |  |  |
Segment revenues: |  |  |  |  |  |  |  |  |
Service revenues |  |  |  |  |  |  |  |  |
External | $ | 2,263 |  |  | $ | 987 |  |  | $ | 786 |  |  | $ | — |  |  | $ | 4,036 |
Internal | 48 |  |  | 7 |  |  | 98 |  |  | — |  |  | 153 |
Total service revenues | 2,311 |  |  | 994 |  |  | 884 |  |  | — |  |  | 4,189 |
Total service revenues – commodity consideration | 51 |  |  | 1 |  |  | 44 |  |  | — |  |  | 96 |
Product sales |  |  |  |  |  |  |  |  |
External | 57 |  |  | 35 |  |  | 71 |  |  | 1,461 |  |  | 1,624 |
Internal | 166 |  |  | 66 |  |  | 403 |  |  | (319) |  |  | 316 |
Total product sales | 223 |  |  | 101 |  |  | 474 |  |  | 1,142 |  |  | 1,940 |
Net gain (loss) from commodity derivatives |  |  |  |  |  |  |  |  |
Realized | (1) |  |  | — |  |  | (1) |  |  | (33) |  |  | (35) |
Unrealized | — |  |  | — |  |  | — |  |  | (9) |  |  | (9) |
Total net gain (loss) from commodity derivatives (2) | (1) |  |  | — |  |  | (1) |  |  | (42) |  |  | (44) |
Total revenues of reportable segments | $ | 2,584 |  |  | $ | 1,096 |  |  | $ | 1,401 |  |  | $ | 1,100 |  |  | $ | 6,181 |
Segment costs and expenses and Proportional Modified EBITDA of equity-method investments: |  |  |  |  |  |  |  |  |
Product costs and net realized processing commodity expenses | (242) |  |  | (90) |  |  | (455) |  |  | (934) |  |  |
Net unrealized gain (loss) from commodity derivatives within Net processing commodity expenses | — |  |  | — |  |  | — |  |  | 2 |  |  |
Operating and administrative expenses (3) | (556) |  |  | (219) |  |  | (302) |  |  | (58) |  |  |
Recoverable power, transportation, and storage costs (4) | (125) |  |  | (83) |  |  | (29) |  |  | — |  |  |
Other segment income (expenses) - net (5) | 15 |  |  | (2) |  |  | 10 |  |  | 1 |  |  |
Proportional Modified EBITDA of equity-method investments | 73 |  |  | 313 |  |  | 70 |  |  | 11 |  |  |
Total Modified EBITDA of reportable segments | $ | 1,749 |  |  | $ | 1,015 |  |  | $ | 695 |  |  | $ | 122 |  |  | $ | 3,581 |
Reconciliation of Modified EBITDA: |  |  |  |  |  |  |  |  |
Contributions from upstream operations, corporate, and other business activities |  | 193 |
Depreciation, depletion, and amortization expenses |  | (1,190) |
Equity earnings (losses) |  | 297 |
Other investing income (loss) - net |  | 12 |
Interest expense |  | (699) |
Accretion expense associated with AROs for nonregulated operations |  | (48) |
Proportional Modified EBITDA of equity-method investments |  | (467) |
Income (loss) before income taxes |  | $ | 1,679 |
Additions to long-lived segment assets | $ | 1,027 |  |  | $ | 113 |  |  | $ | 795 |  |  | $ | 1 |  |  | $ | 1,936 |
As of June 30, 2026 |  |  |  |  |  |  |  |
Equity-method investments by reportable segment | $ | 537 |  |  | $ | 3,183 |  |  | $ | 432 |  |  | $ | 289 |  |  | $ | 4,441 |
Segment assets | $ | 29,057 |  |  | $ | 12,279 |  |  | $ | 12,163 |  |  | $ | 308 |  |  | $ | 53,807 |
As of December 31, 2025 |  |  |  |  |  |  |  |
Equity-method investments by reportable segment | $ | 512 |  |  | $ | 3,236 |  |  | $ | 460 |  |  | $ | 292 |  |  | $ | 4,500 |
Segment assets | $ | 26,515 |  |  | $ | 12,533 |  |  | $ | 12,398 |  |  | $ | 317 |  |  | $ | 51,763 |
_______________________ (1) 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. (2) 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. (3) 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. (4) Recoverable power, transportation and storage costs are charges incurred which are reimbursable pursuant to FERC stipulations or customer contracts. (5) Other segment income (expenses) - net primarily includes equity AFUDC and regulatory credits and charges related to Williams’ regulated operations.

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