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Debt and Banking Arrangements Credit Facilities and Commercial Paper (Details 2) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Credit Facility and Commercial Paper [Line Items]    
Commercial paper, outstanding $ 40 $ 0
Williams Companies Inc [Member]    
Credit Facility and Commercial Paper [Line Items]    
Credit facility, capacity [1] 4,500  
Credit facility, loans outstanding [1] 0  
Commercial Paper [Member] | Williams Companies Inc [Member]    
Credit Facility and Commercial Paper [Line Items]    
Commercial paper, outstanding 40  
Credit facility, capacity $ 4,000  
Short-term Debt, Weighted Average Interest Rate, at Point in Time 0.35%  
Letters Of Credit Under Certain Bilateral Bank Agreements [Member] | Williams Companies Inc [Member]    
Credit Facility and Commercial Paper [Line Items]    
Credit facility, letters of credit outstanding $ 15  
[1] In managing our available liquidity, we do not expect a maximum outstanding amount in excess of the capacity of our credit facility inclusive of any outstanding amounts under our commercial paper program.