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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Related Party Transaction [Line Items]      
Cash distributions $ 1,100 $ 1,200  
Related Party Transaction Revenue with Affiliates 37 37  
Related Party Transaction Expenditures from Transactions with Related Party $ 93 93  
Equity Method Investments and Joint Ventures [Abstract]      
Ownership Percentage in TTX Company 17.30%    
Equity Method Investments $ 664   $ 656
Parent Company      
Related Party Transaction [Line Items]      
Cash distributions 1,100 1,200  
Tax payments to parent company   $ 1  
Accounts Payable, Related Parties $ 283   $ 31