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Schedule I—Condensed Financial Information of Registrant (Parent Company Only) (Transactions With Affiliates) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule I—Condensed Financial Information of Registrant (Parent Company Only) [Abstract]      
Receivables from affiliates $ 0    
Dividends received 43 $ 40 $ 45
Payable to affiliate $ 285 $ 291