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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Related Party Transaction [Line Items]                  
Cash distributions $ 700 $ 1,300 $ 1,100 $ 1,000 $ 1,200 $ 1,200 $ 3,100 $ 3,400  
Tax refunds from Parent company             29    
Related Party Transaction Revenue with Affiliates 28     39     94 118  
Related Party Transaction Expenditures from Transactions with Related Party $ 85     $ 93     $ 259 286  
Equity Method Investments and Joint Ventures [Abstract]                  
Ownership Percentage in TTX Company 17.30%           17.30%    
Equity Method Investments $ 691           $ 691   $ 656
Parent Company                  
Related Party Transaction [Line Items]                  
Cash distributions             3,100 3,400  
Tax payments to parent company             781 $ 741  
Accounts Payable, Related Parties $ 3           $ 3   $ 31