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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Related Party Transaction [Line Items]                  
Cash distributions $ 1,000 $ 1,200 $ 1,200 $ 1,875 $ 1,175 $ 1,100 $ 3,400 $ 4,150  
Related Party Transaction Revenue with Affiliates 39     39     118 106  
Related Party Transaction Expenditures from Transactions with Related Party $ 93     $ 95     $ 286 281  
Equity Method Investments and Joint Ventures [Abstract]                  
Ownership Percentage in TTX Company 17.30%           17.30%    
Equity Method Investments $ 645           $ 645   $ 609
Parent Company                  
Related Party Transaction [Line Items]                  
Cash distributions             3,400 4,200  
Tax payments to parent company             741 591  
Proceeds from Income Tax Refunds               $ 217  
Accounts Payable, Related Parties $ 32           $ 32   $ 54