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Variable Interest Entities (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Dec. 31, 2022
Variable Interest Entity [Line Items]
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents	$ 762	$ 2,150	$ 2,074	$ 152
Receivables, Net, Current	1,310	1,655
Inventory, Net	275	274
Other current assets and deferred charges	208	195
Property, Plant and Equipment, Net	37,974	34,311
Intangible assets – net of accumulated amortization	7,305	7,593
Other Assets, Noncurrent	1,659	1,573
Accounts payable	(1,137)	(1,379)
Accrued Liabilities, Current	(1,203)	(1,284)
Other Liabilities and Deferred Revenue, Noncurrent	(5,116)	(4,684)
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents	35	33
Receivables, Net, Current	184	215
Inventory, Net	5	5
Other current assets and deferred charges	5	4
Property, Plant and Equipment, Net	4,934	5,046
Intangible assets – net of accumulated amortization	1,968	2,049
Other Assets, Noncurrent	27	31
Accounts payable	(54)	(109)
Accrued Liabilities, Current	(26)	(28)
Other Liabilities and Deferred Revenue, Noncurrent	$ (262)	$ (268)
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	$ 74