Credit Facility and Commercial Paper (Details) - USD ($) $ in Millions		Mar. 31, 2025	Dec. 31, 2024
Credit Facility and Commercial Paper [Line Items]
Commercial paper, outstanding		$ 322	$ 455
Williams Companies Inc [Member]
Credit Facility and Commercial Paper [Line Items]
Credit facility, capacity	[1]	3,750
Credit facility, loans outstanding	[1]	0
Williams Companies Inc [Member] | Commercial paper [Member]
Credit Facility and Commercial Paper [Line Items]
Commercial paper, outstanding		$ 322
Short-Term Debt, Weighted Average Interest Rate, at Point in Time		4.65%
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		$ 27
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] | Letters of credit [Member]
Credit Facility and Commercial Paper [Line Items]
Credit facility, capacity		$ 500

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