Variable Interest Entities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Variable Interest Entity [Line Items]
Equity-method investments	$ 4,107	$ 4,614	$ 5,048
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents	60	2,150	152	$ 1,680
Receivables, Net, Current	1,863	1,655
Inventory, Net	279	274
Other current assets and deferred charges	192	195
Property, Plant and Equipment, Net	38,692	34,311
Intangible assets – net of accumulated amortization	7,209	7,593
Other Assets, Noncurrent	1,830	1,573	$ 1,319
Accounts payable	(1,613)	(1,379)
Other current liabilities	(1,360)	(1,284)
Other Liabilities and Deferred Revenue, Noncurrent	(5,268)	(4,684)
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents	15	33
Receivables, Net, Current	178	215
Inventory, Net	5	5
Other current assets and deferred charges	7	4
Property, Plant and Equipment, Net	4,896	5,046
Intangible assets – net of accumulated amortization	1,940	2,049
Other Assets, Noncurrent	27	31
Accounts payable	(57)	(109)
Other current liabilities	(29)	(28)
Other Liabilities and Deferred Revenue, Noncurrent	$ (263)	$ (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	$ 72