Revenue Recognition Contract Assets (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Contract With Customer, Asset [Line Items]
Contract with Customer, Asset, Net - Beginning of Period	$ 104	$ 50	$ 98	$ 36
Contract with Customer, Asset, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress	28	40	58	81
Contract with Customer, Asset, Reclassified to Receivable	(30)	(23)	(53)	(50)
Capitalized Contract Cost, Accumulated Amortization			(1)	0
Contract with Customer, Asset, Net - End of Period	102	67	102	67
Transcontinental Gas Pipe Line Company, LLC [Member]
Contract With Customer, Asset [Line Items]
Contract with Customer, Asset, Net - Beginning of Period	14	0	10	0
Contract with Customer, Asset, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress	0	3	4	3
Contract with Customer, Asset, Reclassified to Receivable	(1)	0	(1)	0
Capitalized Contract Cost, Accumulated Amortization			0	0
Contract with Customer, Asset, Net - End of Period	13	3	13	3
Northwest Pipeline LLC [Member]
Contract With Customer, Asset [Line Items]
Contract with Customer, Asset, Net - Beginning of Period	22	18	21	17
Contract with Customer, Asset, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress	1	1	3	2
Contract with Customer, Asset, Reclassified to Receivable	0	0	0	0
Capitalized Contract Cost, Accumulated Amortization			(1)	0
Contract with Customer, Asset, Net - End of Period	$ 23	$ 19	$ 23	$ 19