Revenue Recognition Contract Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Contract With Customer, Liability [Line Items]
Contract with Customer, Liability - Beginning of Period	$ 1,081	$ 1,043
Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress	183	190
Other Significant Noncash Transaction, Value of Consideration Received	8	9
Contract with Customer, Liability, Increase (Decrease) for Contract Acquired in Business Combination	53	115
Contract with Customer, Liability, Revenue Recognized	(279)	(276)
Contract with Customer, Liability - End of Period	1,046	1,081
Transcontinental Gas Pipe Line Company, LLC [Member]
Contract With Customer, Liability [Line Items]
Contract with Customer, Liability - Beginning of Period	184	194
Contract with Customer, Liability, Revenue Recognized	(11)	(10)
Contract with Customer, Liability - End of Period	173	184
Northwest Pipeline LLC [Member]
Contract With Customer, Liability [Line Items]
Contract with Customer, Liability - Beginning of Period	2	3
Contract with Customer, Liability, Revenue Recognized	(2)	(1)
Contract with Customer, Liability - End of Period	$ 0	$ 2