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Long-Term Debt Issuances and Retirements (Details) - USD ($)
$ in Millions
Mar. 02, 2026
Jan. 08, 2026
Nov. 20, 2025
The Williams Companies, Inc. [Member] | 5.65 Percent Senior Unsecured Notes Due 2033      
Debt Instrument [Line Items]      
Long-term debt face amount [1]   $ 500  
Long-term debt interest rate [1]   5.65%  
The Williams Companies, Inc. [Member] | 5.15 Percent Senior Unsecured Notes Due 2036      
Debt Instrument [Line Items]      
Long-term debt face amount   $ 1,250  
Long-term debt interest rate   5.15%  
The Williams Companies, Inc. [Member] | 5.95 Percent Senior Unsecured Notes Due 2056      
Debt Instrument [Line Items]      
Long-term debt face amount   $ 1,000  
Long-term debt interest rate   5.95%  
The Williams Companies, Inc. [Member] | 5.40 Percent Senior Unsecured Notes Due 2026      
Debt Instrument [Line Items]      
Long-term debt interest rate 5.40%    
Extinguishment of Debt, Amount $ 1,100    
Transcontinental Gas Pipe Line Company, LLC [Member] | 5.1 Percent Senior Unsecured Notes Due 2036      
Debt Instrument [Line Items]      
Long-term debt face amount     $ 1,000
Long-term debt interest rate     5.10%
Transcontinental Gas Pipe Line Company, LLC [Member] | 5.75 Percent Senior Unsecured Notes Due 2056      
Debt Instrument [Line Items]      
Long-term debt face amount     $ 700
Long-term debt interest rate     5.75%
[1] Additional issuance of the 5.65 percent senior notes due 2033 issued on March 2, 2023, and trade interchangeably with such notes.