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Long-Term Debt Issuances and Retirements (Details) - The Williams Companies, Inc. [Member] - USD ($)
$ in Millions
Sep. 15, 2025
Jan. 15, 2025
Jun. 30, 2025
Jan. 09, 2025
4.625 Percent Senior Unsecured Notes Due 2030 [Member]        
Debt Instrument [Line Items]        
Long-term debt face amount     $ 750  
Long-term debt interest rate     4.625%  
5.3 Percent Senior Unsecured Notes Due 2035 [Member]        
Debt Instrument [Line Items]        
Long-term debt face amount     $ 750  
Long-term debt interest rate     5.30%  
5.6 Percent Senior Unsecured Notes Due 2035        
Debt Instrument [Line Items]        
Long-term debt face amount       $ 1,000
Long-term debt interest rate       5.60%
6.0 Percent Senior Unsecured Notes Due 2055        
Debt Instrument [Line Items]        
Long-term debt face amount       $ 500
Long-term debt interest rate       6.00%
3.9% Senior Unsecured Notes Due 2025 [Member]        
Debt Instrument [Line Items]        
Long-term debt interest rate   3.90%    
Extinguishment of Debt, Amount   $ 750    
4% Senior Unsecured Notes Due 2025 [Member]        
Debt Instrument [Line Items]        
Long-term debt interest rate 4.00%      
Extinguishment of Debt, Amount $ 750