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Debt and Banking Arrangements Credit Facility and Commercial Paper (Details 2) - USD ($)
$ in Millions
Oct. 08, 2026
Jun. 30, 2023
Dec. 31, 2022
Credit Facility and Commercial Paper [Line Items]      
Commercial paper, outstanding   $ 0 $ 350
Williams Companies Inc [Member]      
Credit Facility and Commercial Paper [Line Items]      
Credit facility, capacity [1]   3,750  
Credit facility, loans outstanding [1]   0  
Williams Companies Inc [Member] | Forecast      
Credit Facility and Commercial Paper [Line Items]      
Line Of Credit Facility, Maximum Borrowing Capacity Commitment Increase (Decrease) $ (194)    
Commercial Paper [Member] | Williams Companies Inc [Member]      
Credit Facility and Commercial Paper [Line Items]      
Commercial paper, outstanding   0  
Credit facility, capacity   3,500  
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   $ 17  
[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.