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Contingencies (Details) - USD ($)
$ in Millions
 1 Months Ended 6 Months Ended
May 31, 2026
Apr. 30, 2026
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Loss Contingencies [Line Items]          
Accrued environmental loss liabilities     $ 37    
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]     Other Liabilities and Deferred Revenue, Noncurrent, Other current liabilities    
Other current liabilities     $ 1,518   $ 1,639
Transcontinental Gas Pipe Line Company, LLC [Member]          
Loss Contingencies [Line Items]          
Deferred Revenue, Refund Payments   $ 221      
Regulatory Assets, Current     146   126
Other current liabilities     204   143
Transcontinental Gas Pipe Line Company, LLC [Member] | Environmental Restoration Costs          
Loss Contingencies [Line Items]          
Accrued environmental loss liabilities     $ 10    
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]     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    
Northwest Pipeline LLC [Member]          
Loss Contingencies [Line Items]          
Regulatory Assets, Current     4   3
Other current liabilities     39   32
Northwest Pipeline LLC [Member] | Environmental Restoration Costs          
Loss Contingencies [Line Items]          
Accrued environmental loss liabilities     $ 1    
Environmental Loss Contingency, Statement of Financial Position [Extensible Enumeration]     Other current liabilities, Other Liabilities, Noncurrent    
Northwest Pipeline LLC [Member] | Washington State Climate Commitment Act          
Loss Contingencies [Line Items]          
Regulatory Assets, Current     $ 86   72
Other current liabilities     4   $ 6
Interest Income, Other     2 $ 2  
Gas Pipeline [Member]          
Loss Contingencies [Line Items]          
Accrued environmental loss liabilities     11    
Unrecorded Estimated Recoveries For Environmental Loss Contingencies     3    
Natural Gas Underground Storage Facilities [Member]          
Loss Contingencies [Line Items]          
Accrued environmental loss liabilities     7    
Former Operations [Member]          
Loss Contingencies [Line Items]          
Accrued environmental loss liabilities     $ 19    
Construction Project | Transcontinental Gas Pipe Line Company, LLC [Member]          
Loss Contingencies [Line Items]          
Litigation Settlement, Amount Awarded from Other Party $ 22