Variable Interest Entities (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2024	Dec. 31, 2023	Jun. 30, 2023	Dec. 31, 2022
Variable Interest Entity [Line Items]
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents	$ 55	$ 2,150	$ 551	$ 152
Receivables, Net, Current	1,398	1,655
Inventory, Net	274	274
Other current assets and deferred charges	170	195
Property, Plant and Equipment, Net	36,702	34,311
Intangible assets – net of accumulated amortization	7,402	7,593
Other Assets, Noncurrent	1,578	1,573
Accounts payable	(1,192)	(1,379)
Accrued Liabilities, Current	(1,229)	(1,284)
Other Liabilities and Deferred Revenue, Noncurrent	(4,764)	(4,684)
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents	39	33
Receivables, Net, Current	170	215
Inventory, Net	5	5
Other current assets and deferred charges	2	4
Property, Plant and Equipment, Net	4,980	5,046
Intangible assets – net of accumulated amortization	1,995	2,049
Other Assets, Noncurrent	28	31
Accounts payable	(64)	(109)
Accrued Liabilities, Current	(30)	(28)
Other Liabilities and Deferred Revenue, Noncurrent	$ (269)	$ (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	$ 73