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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Related Party Transaction [Line Items]      
Cash distributions $ 1,000 $ 1,000  
Related Party Transaction Revenue with Affiliates 24 23  
Related Party Transaction Expenditures from Transactions with Related Party $ 90 97  
Equity Method Investments and Joint Ventures [Abstract]      
Ownership Percentage in TTX Company 17.30%    
Equity Method Investments Related to TTX $ 761   $ 749
Parent Company      
Related Party Transaction [Line Items]      
Cash distributions 1,000 1,000  
Tax payments to parent company 0 1  
Tax refunds from Parent company 1 $ 0  
Tax Payable, Related Parties $ 588   $ 124