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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.