Credit Facility and Commercial Paper (Details) $ in Millions		Oct. 08, 2021 USD ($)	Aug. 10, 2018	Dec. 31, 2023 USD ($)		Dec. 31, 2022 USD ($)	Sep. 30, 2021 USD ($)
Credit Facility and Commercial Paper [Line Items]
Commercial paper, outstanding				$ 725		$ 350
Williams Companies Inc [Member]
Credit Facility and Commercial Paper [Line Items]
Credit facility, capacity		$ 3,750		3,750	[1]		$ 4,500
Credit facility, loans outstanding	[1]			0
Additional amount by which credit facility can be increased		$ 500
Maximum ratio of debt to EBITDA after acquisition		5.5
Acquisition Trigger Amount		$ 25
Williams Companies Inc [Member] | Swing Line Loan [Member]
Credit Facility and Commercial Paper [Line Items]
Credit facility, capacity		200
Williams Companies Inc [Member] | Commercial paper [Member]
Credit Facility and Commercial Paper [Line Items]
Credit facility, capacity		3,500
Commercial paper, outstanding				$ 725		$ 350
Commercial paper, maximum maturity			397 days
Short-Term Debt, Weighted Average Interest Rate, at Point in Time				5.60%		4.80%
Williams Companies Inc [Member] | Letters of credit [Member]
Credit Facility and Commercial Paper [Line Items]
Credit facility, capacity		$ 500
Williams Companies Inc [Member] | Letters Of Credit Under Certain Bilateral Bank Agreements [Member]
Credit Facility and Commercial Paper [Line Items]
Credit facility, letters of credit outstanding				$ 16
Transcontinental Gas Pipe Line Company, LLC [Member]
Credit Facility and Commercial Paper [Line Items]
Maximum ratio of debt to capitalization		65.00%
Transcontinental Gas Pipe Line Company, LLC [Member] | Letters of credit [Member]
Credit Facility and Commercial Paper [Line Items]
Credit facility, capacity		$ 500
Northwest Pipeline LLC [Member]
Credit Facility and Commercial Paper [Line Items]
Maximum ratio of debt to capitalization		65.00%
Northwest Pipeline LLC [Member] | Letters of credit [Member]
Credit Facility and Commercial Paper [Line Items]
Credit facility, capacity		$ 500
Dec21 And Subsequent Quarters [Member] | Williams Companies Inc [Member]
Credit Facility and Commercial Paper [Line Items]
Maximum ratio of debt to EBITDA		5.0

[1] In managing our available liquidity, we do not expect a maximum outstanding amount in excess of the capacity of our credit facility inclusive of any outstanding amounts under our commercial paper program.