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General, Description of Business, and Basis of Presentation (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Sep. 01, 2021
Accelerated Share Repurchases [Line Items]        
Stock Repurchase Program, Authorized Amount       $ 1,500
Purchases of treasury stock $ 56 $ 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) $ 115