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Revenue Recognition Contract Assets (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Contract With Customer, Asset [Line Items]        
Contract with Customer, Asset, Net - Beginning of Period $ 102 $ 67 $ 98 $ 36
Contract with Customer, Asset, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress 13 44 71 125
Contract with Customer, Asset, Reclassified to Receivable (5) (23) (58) (73)
Contract with Customer, Asset, Increase (Decrease) for Contract Acquired in Business Combination 0 36 0 36
Capitalized Contract Cost, Accumulated Amortization (2) 0 (3) 0
Contract with Customer, Asset, Net - End of Period 108 124 108 124
Transcontinental Gas Pipe Line Company, LLC [Member]        
Contract With Customer, Asset [Line Items]        
Contract with Customer, Asset, Net - Beginning of Period 13 3 10 0
Contract with Customer, Asset, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress 0 4 4 7
Contract with Customer, Asset, Reclassified to Receivable 0 0 0 0
Contract with Customer, Asset, Increase (Decrease) for Contract Acquired in Business Combination 0 0 0 0
Capitalized Contract Cost, Accumulated Amortization 0 0 (1) 0
Contract with Customer, Asset, Net - End of Period 13 7 13 7
Northwest Pipeline LLC [Member]        
Contract With Customer, Asset [Line Items]        
Contract with Customer, Asset, Net - Beginning of Period 23 19 21 17
Contract with Customer, Asset, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress 2 1 5 3
Contract with Customer, Asset, Reclassified to Receivable 0 0 0 0
Contract with Customer, Asset, Increase (Decrease) for Contract Acquired in Business Combination 0 0 0 0
Capitalized Contract Cost, Accumulated Amortization (1) 0 (2) 0
Contract with Customer, Asset, Net - End of Period $ 24 $ 20 $ 24 $ 20