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Revenue by Category (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | $ 3,379 | $ 3,378 | $ 8,097 | $ 7,565
Revenue Not from Contract with Customer, Other | [1] | 578 | 671 | 1,761 | 1,758
Revenues Adjustments For Certain Risk Management Activities Costs | [2] | (904) | (1,268) | (3,775) | (3,494)
Total revenues |  | 3,053 | 2,781 | 6,083 | 5,829
Regulated Service [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 925 | 906 | 1,901 | 1,806
NonRegulated Service Monetary Consideration [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 1,152 | 1,072 | 2,296 | 2,111
NonRegulated Service Commodity Consideration [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 45 | 47 | 91 | 96
Total revenues |  | 45 | 47 | 91 | 96
Other Service [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 38 | 38 | 97 | 81
Service [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 2,160 | 2,063 | 4,385 | 4,094
Total revenues |  | 2,152 | 2,041 | 4,358 | 4,044
Product [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 1,219 | 1,315 | 3,712 | 3,471
Total revenues |  | 762 | 657 | 1,899 | 1,715
Operating Segments [Member] | Transmission, Power & Gulf [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 1,369 | 1,302 | 2,799 | 2,569
Revenue Not from Contract with Customer, Other | [1] | 16 | 10 | 27 | 15
Revenues Adjustments For Certain Risk Management Activities Costs | [2] | 0 | 0 | 0 | 0
Total revenues |  | 1,385 | 1,312 | 2,826 | 2,584
Operating Segments [Member] | Transmission, Power & Gulf [Member] | Regulated Service [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 944 | 927 | 1,940 | 1,847
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 |  | 261 | 226 | 505 | 418
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 |  | 23 | 28 | 49 | 51
Total revenues |  | 23 | 28 | 49 | 51
Operating Segments [Member] | Transmission, Power & Gulf [Member] | Other Service [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 12 | 13 | 47 | 30
Operating Segments [Member] | Transmission, Power & Gulf [Member] | Service [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 1,240 | 1,194 | 2,541 | 2,346
Total revenues |  | 1,237 | 1,176 | 2,524 | 2,311
Operating Segments [Member] | Transmission, Power & Gulf [Member] | Product [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 129 | 108 | 258 | 223
Total revenues |  | 129 | 108 | 258 | 223
Operating Segments [Member] | Northeast G & P [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 534 | 529 | 1,065 | 1,073
Revenue Not from Contract with Customer, Other | [1] | 13 | 12 | 25 | 23
Revenues Adjustments For Certain Risk Management Activities Costs | [2] | 0 | 0 | 0 | 0
Total revenues |  | 547 | 541 | 1,090 | 1,096
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 |  | 490 | 460 | 958 | 922
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 |  | 1 | 0 | 1 | 1
Total revenues |  | 1 | 0 | 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 |  | 26 | 25 | 50 | 49
Operating Segments [Member] | Northeast G & P [Member] | Service [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 517 | 485 | 1,009 | 972
Total revenues |  | 529 | 497 | 1,033 | 994
Operating Segments [Member] | Northeast G & P [Member] | Product [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 17 | 44 | 56 | 101
Total revenues |  | 17 | 44 | 56 | 101
Operating Segments [Member] | West [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 724 | 675 | 1,480 | 1,401
Revenue Not from Contract with Customer, Other | [1] | 0 | 1 | (1) | 0
Revenues Adjustments For Certain Risk Management Activities Costs | [2] | 0 | 0 | 0 | 0
Total revenues |  | 724 | 676 | 1,479 | 1,401
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 |  | 469 | 441 | 968 | 871
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 | 41 | 44
Total revenues |  | 21 | 19 | 41 | 44
Operating Segments [Member] | West [Member] | Other Service [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 6 | 5 | 13 | 12
Operating Segments [Member] | West [Member] | Service [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 496 | 465 | 1,022 | 927
Total revenues |  | 476 | 446 | 982 | 884
Operating Segments [Member] | West [Member] | Product [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 228 | 210 | 458 | 474
Total revenues |  | 228 | 210 | 458 | 474
Operating Segments [Member] | Gas & NGL Marketing Services |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 1,096 | 1,213 | 3,473 | 3,269
Revenue Not from Contract with Customer, Other | [1] | 537 | 596 | 1,733 | 1,696
Revenues Adjustments For Certain Risk Management Activities Costs | [2] | (995) | (1,420) | (4,034) | (3,865)
Total revenues | [3] | 638 | 389 | 1,172 | 1,100
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 |  | 1,096 | 1,213 | 3,473 | 3,269
Total revenues | [3] | 548 | 403 | 1,401 | 1,142
Corporate, Non-Segment | Other Operating Segment |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | 138 | 137 | 281 | 292
Revenue Not from Contract with Customer, Other | [1] | 13 | 53 | (21) | 26
Revenues Adjustments For Certain Risk Management Activities Costs | [2] | 0 | 0 | 0 | 0
Total revenues |  | 151 | 190 | 260 | 318
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 |  | 138 | 137 | 281 | 292
Intersegment Eliminations [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | (482) | (478) | (1,001) | (1,039)
Revenue Not from Contract with Customer, Other | [1] | (1) | (1) | (2) | (2)
Revenues Adjustments For Certain Risk Management Activities Costs | [2] | 91 | 152 | 259 | 371
Total revenues |  | (392) | (327) | (744) | (670)
Intersegment Eliminations [Member] | Regulated Service [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | (19) | (21) | (39) | (41)
Intersegment Eliminations [Member] | NonRegulated Service Monetary Consideration [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | (68) | (55) | (135) | (100)
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 |  | (6) | (5) | (13) | (10)
Intersegment Eliminations [Member] | Service [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | (93) | (81) | (187) | (151)
Intersegment Eliminations [Member] | Product [Member] |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  | $ (389) | $ (397) | $ (814) | $ (888)
[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 Comprehensive 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 Comprehensive 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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