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Variable Interest Entities (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Dec. 31, 2023
Variable Interest Entity [Line Items]
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation	$ 70	$ 60	$ 762	$ 2,150
Receivables, Net, Current	1,480	1,863
Inventory, Net	339	279
Other current assets and deferred charges	225	192
Property, Plant and Equipment, Net	40,385	38,692
Intangible assets – net	7,004	7,209
Other Assets, Noncurrent	1,888	1,830
Accounts payable	(1,406)	(1,613)
Other current liabilities	(1,472)	(1,360)
Other Liabilities and Deferred Revenue, Noncurrent	(5,084)	(5,268)
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Cash, Cash Equivalent, Restricted Cash, and Restricted Cash Equivalent, Continuing Operation	37	15
Receivables, Net, Current	172	178
Inventory, Net	6	5
Other current assets and deferred charges	5	7
Property, Plant and Equipment, Net	4,813	4,896
Intangible assets – net	1,858	1,940
Other Assets, Noncurrent	23	27
Accounts payable	(68)	(57)
Other current liabilities	(25)	(29)
Other Liabilities and Deferred Revenue, Noncurrent	$ (264)	$ (263)
Variable Interest Entity, Primary Beneficiary [Member] \| Williams Companies Inc [Member] \| Northeast JV [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity Ownership Percentage	65.00%
Variable Interest Entity, Primary Beneficiary [Member] \| Williams Companies Inc [Member] \| Gulfstar One [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity Ownership Percentage	51.00%
Variable Interest Entity, Primary Beneficiary [Member] \| Williams Companies Inc [Member] \| Cardinal Gas Services LLC [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity Ownership Percentage	66.00%
Variable Interest Entity, Not Primary Beneficiary [Member] \| Williams Companies Inc [Member]
Variable Interest Entity [Line Items]
Equity-method investments	$ 216