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Condensed Financial Information of Registrant - Condensed Statements of Comprehensive Income (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]                      
Net income $ (47) $ 42 $ 33 $ 24 $ 30 $ 46 $ 39 $ 28 $ 52 $ 143 $ 62
Unrealized investment gain (loss)                 3 (5) 0
Less: effect of income taxes                 1 (2) 0
Other comprehensive income (loss), net of tax                 2 (3) 0
Comprehensive income                 54 140 62
Parent Company                      
Condensed Financial Statements, Captions [Line Items]                      
Net income                 52 143 62
Unrealized investment gain (loss)                 3 (5) 0
Less: effect of income taxes                 1 (2) 0
Other comprehensive income (loss), net of tax                 2 (3) 0
Comprehensive income                 $ 54 $ 140 $ 62