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General, Description of Business, and Basis of Presentation (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 01, 2021
Accelerated Share Repurchases [Line Items]
Stock Repurchase Program, Authorized Amount					$ 1,500
Purchases of treasury stock			$ 0	$ 130
StockRepurchaseProgramCumulativeAmountPurchased			$ 139
Transmission And Gulf Of Mexico [Member] \| Gulfstream Natural Gas System, LLC [Member]
General and Description Of Business [Abstract]
Equity Method Investment, Ownership Percentage			50.00%
Transmission And Gulf Of Mexico [Member] \| Discovery Producer Services LLC [Member]
General and Description Of Business [Abstract]
Equity Method Investment, Ownership Percentage			60.00%
Transmission And Gulf Of Mexico [Member] \| Williams Companies Inc [Member] \| Gulfstar One [Member]
General and Description Of Business [Abstract]
Variable Interest Entity Ownership Percentage			51.00%
Northeast G And P [Member] \| Laurel Mountain Midstream, LLC [Member]
General and Description Of Business [Abstract]
Equity Method Investment, Ownership Percentage			69.00%
Northeast G And P [Member] \| Blue Racer Midstream LLC [Member]
General and Description Of Business [Abstract]
Equity Method Investment, Ownership Percentage			50.00%
Northeast G And P [Member] \| Williams Companies Inc [Member] \| Northeast JV [Member]
General and Description Of Business [Abstract]
Variable Interest Entity Ownership Percentage			65.00%
Northeast G And P [Member] \| Williams Companies Inc [Member] \| Cardinal Gas Services LLC [Member]
General and Description Of Business [Abstract]
Variable Interest Entity Ownership Percentage			66.00%
Northeast G And P [Member] \| Williams Companies Inc [Member] \| Appalachia Midstream Services, LLC [Member]
General and Description Of Business [Abstract]
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest			66.00%
West [Member] \| Overland Pass Pipeline Company LLC [Member]
General and Description Of Business [Abstract]
Equity Method Investment, Ownership Percentage			50.00%
West [Member] \| Rocky Mountain Midstream Holdings LLC [Member]
General and Description Of Business [Abstract]
Equity Method Investment, Ownership Percentage	50.00%			50.00%
West [Member] \| Williams Companies Inc [Member] \| Conway Fractionator [Member]
General and Description Of Business [Abstract]
Subsidiary of Limited Liability Company or Limited Partnership, Ownership Interest			50.00%
Former Alaska Refinery [Member]
Loss Contingencies [Line Items]
Loss Contingency Accrual, Period Increase (Decrease)	$ 1	$ 115