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General, Description of Business, and Basis of Presentation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
General and Description Of Business [Abstract]      
Equity-method investments $ 4,107 $ 4,614 $ 5,048
Loss Contingencies [Line Items]      
Proceeds from Legal Settlements   627  
Gain (Loss) Related to Litigation Settlement $ 0 534 $ 0
Gulfstream Natural Gas System, LLC [Member]      
General and Description Of Business [Abstract]      
Equity Method Investment, Ownership Percentage 50.00%    
Equity-method investments $ 196 210  
Discovery Producer Services LLC [Member]      
General and Description Of Business [Abstract]      
Equity Method Investment, Ownership Percentage 100.00%    
Equity-method investments [1] $ 0 361  
Laurel Mountain Midstream, LLC [Member]      
General and Description Of Business [Abstract]      
Equity Method Investment, Ownership Percentage 69.00%    
Equity-method investments $ 171 184  
Blue Racer Midstream LLC [Member]      
General and Description Of Business [Abstract]      
Equity Method Investment, Ownership Percentage 50.00%    
Equity-method investments $ 366 398  
Overland Pass Pipeline Company LLC [Member]      
General and Description Of Business [Abstract]      
Equity Method Investment, Ownership Percentage 50.00%    
Equity-method investments $ 385 $ 387  
Williams Companies Inc [Member] | Gulfstar One [Member] | Variable Interest Entity, Primary Beneficiary [Member]      
General and Description Of Business [Abstract]      
Variable Interest Entity Ownership Percentage 51.00%    
Williams Companies Inc [Member] | Northeast JV [Member] | Variable Interest Entity, Primary Beneficiary [Member]      
General and Description Of Business [Abstract]      
Variable Interest Entity Ownership Percentage 65.00%    
Williams Companies Inc [Member] | Cardinal Gas Services LLC [Member] | Variable Interest Entity, Primary Beneficiary [Member]      
General and Description Of Business [Abstract]      
Variable Interest Entity Ownership Percentage 66.00%    
Transmission And Gulf Of America [Member] | Gulfstream Natural Gas System, LLC [Member]      
General and Description Of Business [Abstract]      
Equity Method Investment, Ownership Percentage 50.00%    
Transmission And Gulf Of America [Member] | Discovery Producer Services LLC [Member]      
General and Description Of Business [Abstract]      
Equity Method Investment, Ownership Percentage   60.00%  
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] | 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%
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)   $ 125  
[1] Discovery is a wholly owned subsidiary of Williams as of August 1, 2024. See Note 3 – Acquisitions and Divestitures.