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Contingencies and Commitments (Details) - USD ($)
$ in Millions
 1 Months Ended 3 Months Ended 9 Months Ended
Feb. 28, 2025
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Loss Contingencies [Line Items]            
Accrued environmental loss liabilities   $ 42   $ 42    
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]   Other Liabilities and Deferred Revenue, Noncurrent, Other current liabilities   Other Liabilities and Deferred Revenue, Noncurrent, Other current liabilities    
Other current liabilities   $ 1,472   $ 1,472   $ 1,360
Transcontinental Gas Pipe Line Company, LLC [Member]            
Loss Contingencies [Line Items]            
Regulatory Assets, Current   121   121   74
Other current liabilities   93   93   78
Interest Income, Other   8 $ 14 23 $ 47  
Transcontinental Gas Pipe Line Company, LLC [Member] | Environmental Restoration Costs            
Loss Contingencies [Line Items]            
Accrued environmental loss liabilities   $ 10   $ 10    
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]   Other current liabilities, Other Liabilities, Noncurrent   Other current liabilities, Other Liabilities, Noncurrent    
Transcontinental Gas Pipe Line Company, LLC [Member] | Potentially Responsible Party At Various Superfund And State Waste Disposal Sites | Maximum [Member]            
Loss Contingencies [Line Items]            
Accrual for Environmental Loss Contingencies, Gross   $ 1   $ 1    
Northwest Pipeline LLC [Member]            
Loss Contingencies [Line Items]            
Regulatory Assets, Current   3   3   6
Other current liabilities   22   22   18
Interest Income, Other       2 $ 1  
Northwest Pipeline LLC [Member] | Environmental Restoration Costs            
Loss Contingencies [Line Items]            
Accrued environmental loss liabilities   $ 1   $ 1    
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]   Other current liabilities, Other Liabilities, Noncurrent   Other current liabilities, Other Liabilities, Noncurrent    
Northwest Pipeline LLC [Member] | Washington State Climate Commitment Act            
Loss Contingencies [Line Items]            
Regulatory Assets, Current   $ 62   $ 62   38
Other current liabilities   5   5   $ 3
Capital Addition Purchase Commitments [Member]            
Loss Contingencies [Line Items]            
Commitments for construction and acquisition of property, plant, and equipment   1,100   1,100    
Capital Addition Purchase Commitments [Member] | Transcontinental Gas Pipe Line Company, LLC [Member]            
Loss Contingencies [Line Items]            
Commitments for construction and acquisition of property, plant, and equipment   317   317    
Capital Addition Purchase Commitments [Member] | Northwest Pipeline LLC [Member]            
Loss Contingencies [Line Items]            
Commitments for construction and acquisition of property, plant, and equipment   55   55    
Gas Pipeline [Member]            
Loss Contingencies [Line Items]            
Accrued environmental loss liabilities   11   11    
Recoverable through rates [Member]            
Loss Contingencies [Line Items]            
Accrued environmental loss liabilities   3   3    
Natural Gas Underground Storage Facilities [Member]            
Loss Contingencies [Line Items]            
Accrued environmental loss liabilities   8   8    
Former Operations [Member]            
Loss Contingencies [Line Items]            
Accrued environmental loss liabilities   $ 23   $ 23    
Construction Project | Transcontinental Gas Pipe Line Company, LLC [Member]            
Loss Contingencies [Line Items]            
Litigation Settlement, Amount Awarded to Other Party $ 110          
Loss Contingency Expected Recovery Percentage 29.00%