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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.