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Variable Interest Entities (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2026	Dec. 31, 2025	Jun. 30, 2025	Dec. 31, 2024
Variable Interest Entity [Line Items]
Cash and cash equivalents	$ 203	$ 63	$ 903	$ 60
Receivables, Net, Current	1,968	2,084
Inventories	335	314
Other current assets and deferred charges	398	256
Property, plant, and equipment – net	44,410	41,996
Intangible assets – net	6,577	6,763
Regulatory assets, deferred charges, and other	1,985	2,011
Accounts payable	(2,220)	(2,224)
Other current liabilities	(1,518)	(1,639)
Regulatory liabilities, deferred income, and other	$ (4,979)	(4,986)
Indirect Ownership Interest | Cogentrix Co-Investment Fund, LP | Gas & NGL Marketing Services
Variable Interest Entity [Line Items]
Equity Method Investment, Ownership Percentage	10.00%
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Cash and cash equivalents	$ 183	53
Receivables, Net, Current	170	155
Inventories	7	6
Other current assets and deferred charges	3	5
Property, plant, and equipment – net	4,406	4,412
Intangible assets – net	1,777	1,831
Regulatory assets, deferred charges, and other	21	23
Accounts payable	(61)	(56)
Other current liabilities	(32)	(19)
Regulatory liabilities, deferred income, and other	$ (76)	$ (78)
Variable Interest Entity, Primary Beneficiary [Member] | Williams Companies Inc [Member] | Northeast JV [Member] | Northeast G & P [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity Ownership Percentage	65.00%
Variable Interest Entity, Primary Beneficiary [Member] | Williams Companies Inc [Member] | Cardinal Gas Services LLC [Member] | Northeast G & P [Member]
Variable Interest Entity [Line Items]
Variable Interest Entity Ownership Percentage	66.00%
Variable Interest Entity, Primary Beneficiary [Member] | Williams Companies Inc [Member] | Driftwood Pipeline LLC
Variable Interest Entity [Line Items]
Variable Interest Entity Ownership Percentage	80.00%
Variable Interest Entity, Not Primary Beneficiary [Member] | Williams Companies Inc [Member]
Variable Interest Entity [Line Items]
Equity-method investments	$ 617
Variable Interest Entity, Not Primary Beneficiary [Member] | Williams Companies Inc [Member] | Louisiana LNG LLC
Variable Interest Entity [Line Items]
Variable Interest Entity Ownership Percentage	10.00%
Equity-method investments	$ 289
Variable Interest Entity, Not Primary Beneficiary [Member] | Williams Companies Inc [Member] | Cogentrix Co-Investment Fund, LP
Variable Interest Entity [Line Items]
Equity-method investments	$ 289

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