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Summary of Significant Accounting Policies and Other Matters - Narrative (Details)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Jun. 30, 2024
USD ($)
mi
Sep. 30, 2025
USD ($)
shares
Sep. 30, 2024
shares
Sep. 30, 2025
USD ($)
shares
Sep. 30, 2024
shares
Schedule of Equity Method Investments [Line Items]          
Anti-dilutive effect (shares) | shares   0 0 0 0
Mountain Valley Pipeline LLC | Con Edison Gas Pipeline and Storage, LLC          
Schedule of Equity Method Investments [Line Items]          
Number of miles in pipeline construction | mi 303        
Aggregate project cost $ 8,100        
Equity method investment, ownership percent (in percent)   6.60%   6.60%  
Equity method investments   $ 162   $ 162  
Cash contributions for equity method investments       530  
Earnings from its equity investment   8   22  
Earnings from its equity investment, after tax   $ 6   $ 16