Cash Payments For Interest (Net of Amounts Capitalized) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Williams Companies Inc [Member]
Debt Instrument [Line Items]
Cash payments for interest (net of amounts capitalized)	$ 1,293	$ 1,152	$ 1,117
Transcontinental Gas Pipe Line Company, LLC [Member]
Debt Instrument [Line Items]
Cash payments for interest (net of amounts capitalized)	302	307	326
Northwest Pipeline LLC [Member]
Debt Instrument [Line Items]
Cash payments for interest (net of amounts capitalized)	$ 24	$ 26	$ 26