Revenue Recognition Contract Assets (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Contract With Customer, Asset [Line Items]
Contract with Customer, Asset, Net - Beginning of Period	$ 36	$ 29
Contract with Customer, Asset, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress	170	183
Contract with Customer, Asset, Reclassified to Receivable	(144)	(176)
Contract with Customer, Asset, Increase (Decrease) for Contract Acquired in Business Combination	36	0
Contract with Customer, Asset, Net - End of Period	98	36
Transcontinental Gas Pipe Line Company, LLC [Member]
Contract With Customer, Asset [Line Items]
Contract with Customer, Asset, Net - Beginning of Period	0	0
Contract with Customer, Asset, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress	10	0
Contract with Customer, Asset, Net - End of Period	10	0
Northwest Pipeline LLC [Member]
Contract With Customer, Asset [Line Items]
Contract with Customer, Asset, Net - Beginning of Period	17	13
Contract with Customer, Asset, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress	6	6
Contract with Customer, Asset, Reclassified to Receivable	(2)	(2)
Contract with Customer, Asset, Net - End of Period	$ 21	$ 17