Variable Interest Entities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Equity-method investments	$ 4,614	$ 5,048
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents	2,150	152	$ 1,680	$ 142
Receivables, Net, Current	1,655	2,723
Inventory, Net	274	320
Other current assets and deferred charges	195	279
Property, Plant and Equipment, Net	34,311	30,889
Intangible assets – net of accumulated amortization	7,593	7,363
Other Assets, Noncurrent	1,573	1,319
Accounts payable	(1,379)	(2,327)
Accrued Liabilities, Current	(1,284)	(1,270)
Other Liabilities and Deferred Revenue, Noncurrent	(4,684)	(4,684)
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents	33	49
Receivables, Net, Current	215	136
Inventory, Net	5	4
Other current assets and deferred charges	4	7
Property, Plant and Equipment, Net	5,046	5,154
Intangible assets – net of accumulated amortization	2,049	2,158
Other Assets, Noncurrent	31	29
Accounts payable	(109)	(76)
Accrued Liabilities, Current	(28)	(34)
Other Liabilities and Deferred Revenue, Noncurrent	$ (268)	$ (275)
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] | Targa Train 7 LLC [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity Ownership Percentage	20.00%
Equity-method investments	$ 44
Variable Interest Entity, Not Primary Beneficiary [Member] | Williams Companies Inc [Member] | Brazos Permian II, LLC [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity Ownership Percentage	15.00%
Equity-method investments	$ 27