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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Related Party Transaction [Line Items]        
Cash distributions     $ 1,750 $ 3,000
Related Party Transaction Revenue with Affiliates $ 35 $ 48 108 137
Related Party Transaction Expenditures from Transactions with Related Party $ 73 $ 86 210 248
Parent Company        
Related Party Transaction [Line Items]        
Cash distributions     1,750 3,000
Tax Refund from Parent Company     227 160
Tax payments to parent company     $ 451 $ 863