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Related Party Transactions - Transco and NWP (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended		9 Months Ended
	Oct. 31, 2025	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Related Party Transaction [Line Items]
Accounts payable		$ 1,406		$ 1,406		$ 1,613
Related Party Transaction, Rate				4.00%
Revenues		2,923	$ 2,653	$ 8,752	$ 7,760
Transcontinental Gas Pipe Line Company, LLC [Member]
Related Party Transaction [Line Items]
Interest Income, Other		8	14	23	47
Revenues		844	746	2,405	2,188
Cash distributions to parent				907	830
Transcontinental Gas Pipe Line Company, LLC [Member] | Affiliated Entity
Related Party Transaction [Line Items]
Interest Income, Other		6	12	18	42
Revenues		21	20	63	57
Related Party Transaction, Purchases from Related Party		2	1	7	4
Operating Expenses		88	94	262	254
Transcontinental Gas Pipe Line Company, LLC [Member] | Related Party
Related Party Transaction [Line Items]
Accounts and Financing Receivable, after Allowance for Credit Loss, Current		498		498		638
Accounts payable		48		48		55
Northwest Pipeline LLC [Member]
Related Party Transaction [Line Items]
Interest Income, Other				2	1
Revenues		114	107	338	329
Cash distributions to parent				106	113
Northwest Pipeline LLC [Member] | Affiliated Entity
Related Party Transaction [Line Items]
Accounts payable		0		0		26
Interest Income, Other		1	1	2	5
Operating Expenses		23	$ 25	68	$ 68
Northwest Pipeline LLC [Member] | Affiliated Entity | Subsequent Event [Member]
Related Party Transaction [Line Items]
Cash distributions to parent	$ 42
Northwest Pipeline LLC [Member] | Related Party
Related Party Transaction [Line Items]
Accounts and Financing Receivable, after Allowance for Credit Loss, Current		70		70		0
Accounts payable		$ 9		$ 9		$ 12
Williams Companies Inc [Member] | Affiliated Entity | Subsequent Event [Member]
Related Party Transaction [Line Items]
Cash distributions to parent	$ 50

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