Revenue Recognition Contract Assets (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Contract With Customer, Asset [Line Items]
Contract with Customer, Asset, Net - Beginning of Period	$ 98	$ 36
Contract with Customer, Asset, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress	30	41
Contract with Customer, Asset, Reclassified to Receivable	(23)	(27)
Capitalized Contract Cost, Accumulated Amortization	(1)	0
Contract with Customer, Asset, Net - End of Period	104	50
Transcontinental Gas Pipe Line Company, LLC [Member]
Contract With Customer, Asset [Line Items]
Contract with Customer, Asset, Net - Beginning of Period	10	0
Contract with Customer, Asset, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress	4	0
Contract with Customer, Asset, Reclassified to Receivable	0	0
Capitalized Contract Cost, Accumulated Amortization	0	0
Contract with Customer, Asset, Net - End of Period	14	0
Northwest Pipeline LLC [Member]
Contract With Customer, Asset [Line Items]
Contract with Customer, Asset, Net - Beginning of Period	21	17
Contract with Customer, Asset, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress	2	1
Contract with Customer, Asset, Reclassified to Receivable	0	0
Capitalized Contract Cost, Accumulated Amortization	(1)	0
Contract with Customer, Asset, Net - End of Period	$ 22	$ 18