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Revenue by Category (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | $ 3,491 | $ 3,035 | $ 11,056 | $ 9,221
Revenue Not from Contract with Customer, Other | [1] | 704 | 541 | 2,462 | 1,772
Revenues Adjustments For Certain Risk Management Activities Costs | [2] | (1,272) | (923) | (4,766) | (3,233)
Total revenues |  | 2,923 | 2,653 | 8,752 | 7,760
Regulated Service [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 952 | 859 | 2,758 | 2,544
NonRegulated Service Monetary Consideration [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 1,110 | 999 | 3,221 | 2,933
NonRegulated Service Commodity Consideration [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 45 | 34 | 141 | 82
Total revenues |  | 45 | 34 | 141 | 82
Other Service [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 36 | 31 | 117 | 104
Service [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 2,143 | 1,923 | 6,237 | 5,663
Total revenues |  | 2,121 | 1,911 | 6,165 | 5,653
Product [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 1,348 | 1,112 | 4,819 | 3,558
Total revenues |  | 701 | 703 | 2,416 | 2,158
Operating Segments [Member] | Transmission, Power & Gulf [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 1,384 | 1,162 | 3,953 | 3,330
Revenue Not from Contract with Customer, Other | [1] | 8 | 8 | 23 | 27
Revenues Adjustments For Certain Risk Management Activities Costs | [2] | 0 | 0 | 0 | 0
Total revenues |  | 1,392 | 1,170 | 3,976 | 3,357
Operating Segments [Member] | Transmission, Power & Gulf [Member] | Regulated Service [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 973 | 879 | 2,820 | 2,605
Operating Segments [Member] | Transmission, Power & Gulf [Member] | NonRegulated Service Monetary Consideration [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 247 | 177 | 665 | 480
Operating Segments [Member] | Transmission, Power & Gulf [Member] | NonRegulated Service Commodity Consideration [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 24 | 14 | 75 | 28
Total revenues |  | 24 | 14 | 75 | 28
Operating Segments [Member] | Transmission, Power & Gulf [Member] | Other Service [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 10 | 8 | 40 | 32
Operating Segments [Member] | Transmission, Power & Gulf [Member] | Service [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 1,254 | 1,078 | 3,600 | 3,145
Total revenues |  | 1,237 | 1,072 | 3,548 | 3,144
Operating Segments [Member] | Transmission, Power & Gulf [Member] | Product [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 130 | 84 | 353 | 185
Total revenues |  | 130 | 84 | 353 | 185
Operating Segments [Member] | Northeast G & P [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 519 | 491 | 1,592 | 1,461
Revenue Not from Contract with Customer, Other | [1] | 11 | 11 | 34 | 33
Revenues Adjustments For Certain Risk Management Activities Costs | [2] | 0 | 0 | 0 | 0
Total revenues |  | 530 | 502 | 1,626 | 1,494
Operating Segments [Member] | Northeast G & P [Member] | Regulated Service [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 0 | 0 | 0 | 0
Operating Segments [Member] | Northeast G & P [Member] | NonRegulated Service Monetary Consideration [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 463 | 442 | 1,385 | 1,317
Operating Segments [Member] | Northeast G & P [Member] | NonRegulated Service Commodity Consideration [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 0 | 1 | 1 | 1
Total revenues |  | 0 | 1 | 1 | 1
Operating Segments [Member] | Northeast G & P [Member] | Other Service [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 25 | 22 | 74 | 69
Operating Segments [Member] | Northeast G & P [Member] | Service [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 488 | 465 | 1,460 | 1,387
Total revenues |  | 499 | 475 | 1,493 | 1,419
Operating Segments [Member] | Northeast G & P [Member] | Product [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 31 | 26 | 132 | 74
Total revenues |  | 31 | 26 | 132 | 74
Operating Segments [Member] | West [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 709 | 663 | 2,110 | 1,978
Revenue Not from Contract with Customer, Other | [1] | 3 | 0 | 3 | 7
Revenues Adjustments For Certain Risk Management Activities Costs | [2] | 0 | 0 | 0 | 0
Total revenues |  | 712 | 663 | 2,113 | 1,985
Operating Segments [Member] | West [Member] | Regulated Service [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 0 | 0 | 0 | 0
Operating Segments [Member] | West [Member] | NonRegulated Service Monetary Consideration [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 464 | 422 | 1,335 | 1,253
Operating Segments [Member] | West [Member] | NonRegulated Service Commodity Consideration [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 21 | 19 | 65 | 53
Total revenues |  | 21 | 19 | 65 | 53
Operating Segments [Member] | West [Member] | Other Service [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 5 | 4 | 17 | 15
Operating Segments [Member] | West [Member] | Service [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 490 | 445 | 1,417 | 1,321
Total revenues |  | 470 | 426 | 1,354 | 1,270
Operating Segments [Member] | West [Member] | Product [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 219 | 218 | 693 | 657
Total revenues |  | 219 | 218 | 693 | 657
Operating Segments [Member] | Gas & NGL Marketing Services |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 1,248 | 1,005 | 4,517 | 3,233
Revenue Not from Contract with Customer, Other | [1] | 658 | 515 | 2,354 | 1,685
Revenues Adjustments For Certain Risk Management Activities Costs | [2] | (1,458) | (1,038) | (5,323) | (3,575)
Total revenues | [3] | 448 | 482 | 1,548 | 1,343
Operating Segments [Member] | Gas & NGL Marketing Services | Regulated Service [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 0 | 0 | 0 | 0
Operating Segments [Member] | Gas & NGL Marketing Services | NonRegulated Service Monetary Consideration [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 0 | 0 | 0 | 0
Operating Segments [Member] | Gas & NGL Marketing Services | NonRegulated Service Commodity Consideration [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 0 | 0 | 0 | 0
Total revenues | [3] | 0 | 0 | 0 | 0
Operating Segments [Member] | Gas & NGL Marketing Services | Other Service [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 0 | 0 | 0 | 0
Operating Segments [Member] | Gas & NGL Marketing Services | Service [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 0 | 0 | 0 | 0
Total revenues | [3] | 0 | 0 | 0 | 0
Operating Segments [Member] | Gas & NGL Marketing Services | Product [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 1,248 | 1,005 | 4,517 | 3,233
Total revenues | [3] | 415 | 481 | 1,557 | 1,491
Corporate, Non-Segment | Other Operating Segment |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 136 | 95 | 428 | 289
Revenue Not from Contract with Customer, Other | [1] | 24 | 8 | 50 | 22
Revenues Adjustments For Certain Risk Management Activities Costs | [2] | 0 | 0 | 0 | 0
Total revenues |  | 160 | 103 | 478 | 311
Corporate, Non-Segment | Other Operating Segment | Regulated Service [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 0 | 0 | 0 | 0
Corporate, Non-Segment | Other Operating Segment | NonRegulated Service Monetary Consideration [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 0 | 0 | 0 | 0
Corporate, Non-Segment | Other Operating Segment | NonRegulated Service Commodity Consideration [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 0 | 0 | 0 | 0
Corporate, Non-Segment | Other Operating Segment | Other Service [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 0 | 0 | 0 | 0
Corporate, Non-Segment | Other Operating Segment | Service [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 0 | 0 | 0 | 0
Corporate, Non-Segment | Other Operating Segment | Product [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 136 | 95 | 428 | 289
Intersegment Eliminations [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | (505) | (381) | (1,544) | (1,070)
Revenue Not from Contract with Customer, Other | [1] | 0 | (1) | (2) | (2)
Revenues Adjustments For Certain Risk Management Activities Costs | [2] | 186 | 115 | 557 | 342
Total revenues |  | (319) | (267) | (989) | (730)
Intersegment Eliminations [Member] | Regulated Service [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | (21) | (20) | (62) | (61)
Intersegment Eliminations [Member] | NonRegulated Service Monetary Consideration [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | (64) | (42) | (164) | (117)
Intersegment Eliminations [Member] | NonRegulated Service Commodity Consideration [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 0 | 0 | 0 | 0
Intersegment Eliminations [Member] | Other Service [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | (4) | (3) | (14) | (12)
Intersegment Eliminations [Member] | Service [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | (89) | (65) | (240) | (190)
Intersegment Eliminations [Member] | Product [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | $ (416) | $ (316) | $ (1,304) | $ (880)
[1] | Revenues not derived from contracts with customers primarily consist of physical product sales related to commodity derivative contracts, realized and unrealized gains and losses associated with Williams’ commodity derivative contracts, which are reported in Net gain (loss) from commodity derivatives in the Consolidated Statement of Income, management fees received for certain services provided to operated equity-method investments, and leasing revenues associated with the Williams headquarters building.
[2] | Other adjustments reflect certain costs of Gas & NGL Marketing Services’ risk management activities. 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 in the Consolidated Statement of Income.
[3] | 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.

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