Revenue Recognition Contract Liabilities (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, Liability [Line Items]
Contract with Customer, Liability - Beginning of Period	$ 1,054	$ 1,064	$ 1,046	$ 1,081
Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress	32	33	152	150
Contract with Customer, Liability, Increase (Decrease) for Contract from Asset Purchase			23	0
Other Significant Noncash Transaction, Value of Consideration Received	1	2	5	6
Contract with Customer, Liability, Increase (Decrease) for Contract Acquired in Business Combination	0	53	0	53
Contract with Customer, Liability, Revenue Recognized	(83)	(66)	(222)	(204)
Contract with Customer, Liability - End of Period	1,004	1,086	1,004	1,086
Transcontinental Gas Pipe Line Company, LLC [Member]
Contract With Customer, Liability [Line Items]
Contract with Customer, Liability - Beginning of Period	168	179	173	184
Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress	0	0	0	0
Contract with Customer, Liability, Increase (Decrease) for Contract from Asset Purchase			0	0
Other Significant Noncash Transaction, Value of Consideration Received	0	0	0	0
Contract with Customer, Liability, Increase (Decrease) for Contract Acquired in Business Combination	0	0	0	0
Contract with Customer, Liability, Revenue Recognized	(3)	(3)	(8)	(8)
Contract with Customer, Liability - End of Period	165	176	165	176
Northwest Pipeline LLC [Member]
Contract With Customer, Liability [Line Items]
Contract with Customer, Liability - Beginning of Period	0	1	0	2
Contract with Customer, Liability, Cumulative Catch-up Adjustment to Revenue, Change in Measure of Progress	0	0	0	0
Contract with Customer, Liability, Increase (Decrease) for Contract from Asset Purchase			0	0
Other Significant Noncash Transaction, Value of Consideration Received	0	0	0	0
Contract with Customer, Liability, Increase (Decrease) for Contract Acquired in Business Combination	0	0	0	0
Contract with Customer, Liability, Revenue Recognized	0	0	0	(1)
Contract with Customer, Liability - End of Period	$ 0	$ 1	$ 0	$ 1

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration from customer has been received or is due, from business combination.

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