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Credit Facility and Commercial Paper (Details)
$ in Millions
May 19, 2026
USD ($)
Jun. 30, 2026
USD ($)
Dec. 31, 2025
USD ($)
Oct. 08, 2021
Credit Facility and Commercial Paper [Line Items]        
Commercial paper, outstanding   $ 475 $ 700  
Williams Companies Inc [Member]        
Credit Facility and Commercial Paper [Line Items]        
Acquisition Trigger Amount $ 25      
Maximum ratio of debt to EBITDA after acquisition 5.5      
Williams Companies Inc [Member] | Revolving Credit Facility        
Credit Facility and Commercial Paper [Line Items]        
Credit facility, capacity $ 3,750 3,750 [1],[2]    
Additional amount by which credit facility can be increased 500      
Line Of Credit Facility Maximum Borrowing Capacity After Available Increased Commitments 4,250      
Credit facility, loans outstanding [1],[2]   0    
Williams Companies Inc [Member] | Swing Line Loan [Member]        
Credit Facility and Commercial Paper [Line Items]        
Credit facility, capacity 200      
Williams Companies Inc [Member] | Letters of credit [Member]        
Credit Facility and Commercial Paper [Line Items]        
Credit facility, capacity 500      
Williams Companies Inc [Member] | 364-Day Credit Agreement        
Credit Facility and Commercial Paper [Line Items]        
Credit facility, capacity 1,000 1,000 [2]    
Additional amount by which credit facility can be increased 150      
Line Of Credit Facility Maximum Borrowing Capacity After Available Increased Commitments 1,150      
Credit facility, loans outstanding [1],[2]   0    
Williams Companies Inc [Member] | Letters Of Credit Under Certain Bilateral Bank Agreements [Member]        
Credit Facility and Commercial Paper [Line Items]        
Credit facility, letters of credit outstanding   15    
Williams Companies Inc [Member] | Commercial paper [Member]        
Credit Facility and Commercial Paper [Line Items]        
Credit facility, capacity   $ 3,500    
Short-Term Debt, Weighted Average Interest Rate, at Point in Time   3.94%    
Transcontinental Gas Pipe Line Company, LLC [Member]        
Credit Facility and Commercial Paper [Line Items]        
Maximum ratio of debt to capitalization       65.00%
Transcontinental Gas Pipe Line Company, LLC [Member] | Letters of credit [Member]        
Credit Facility and Commercial Paper [Line Items]        
Credit facility, capacity 500      
Transcontinental Gas Pipe Line Company, LLC [Member] | 364-Day Credit Agreement        
Credit Facility and Commercial Paper [Line Items]        
Credit facility, capacity 100      
Northwest Pipeline LLC [Member]        
Credit Facility and Commercial Paper [Line Items]        
Maximum ratio of debt to capitalization       65.00%
Northwest Pipeline LLC [Member] | Letters of credit [Member]        
Credit Facility and Commercial Paper [Line Items]        
Credit facility, capacity 500      
Northwest Pipeline LLC [Member] | 364-Day Credit Agreement        
Credit Facility and Commercial Paper [Line Items]        
Credit facility, capacity $ 100      
Dec21 And Subsequent Quarters [Member] | Williams Companies Inc [Member]        
Credit Facility and Commercial Paper [Line Items]        
Maximum ratio of debt to EBITDA 5.0      
[1] In managing its available liquidity, Williams does not expect a maximum outstanding amount in excess of the capacity of its credit facility inclusive of any outstanding amounts under the commercial paper program.
[2] Williams expects to be in compliance with the associated covenants for the June 30, 2026, reporting period.