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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Related Party Transaction [Line Items]          
Cash distributions     $ 4,150 $ 2,625  
Related Party Transaction Revenue with Affiliates $ 39 $ 32 106 100  
Related Party Transaction Expenditures from Transactions with Related Party $ 95 $ 82 $ 281 243  
Equity Method Investments and Joint Ventures [Abstract]          
Ownership Percentage in TTX Company 17.30%   17.30%    
Investments related to TTX $ 598   $ 598   $ 554
Parent Company          
Related Party Transaction [Line Items]          
Cash distributions     4,200 2,600  
Tax Refund From Parent     217 21  
Tax payments to parent company     591 $ 1,000  
Receivable from parent company         235
Payable to parent company 74   74   19
Earliest Tax Year [Member] | Parent Company          
Related Party Transaction [Line Items]          
Tax payable to parent related to prior year tax audits $ 33   $ 33   $ 32