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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) | $ 201 | $ 197 | $ 202 | $ 107 | $ (262) | $ (97) | $ (230) | $ 77 | $ 707 | $ (512) | $ 52
Unrealized investment (loss) gain |  |  |  |  |  |  |  |  | (3) | (5) | 3
Less: effect of income taxes |  |  |  |  |  |  |  |  | (1) | (2) | 1
Other comprehensive (loss) income, net of tax |  |  |  |  |  |  |  |  | (2) | (3) | 2
Comprehensive income (loss) |  |  |  |  |  |  |  |  | 705 | (515) | 54
Parent Company |  |  |  |  |  |  |  |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) |  |  |  |  |  |  |  |  | 707 | (512) | 52
Unrealized investment (loss) gain |  |  |  |  |  |  |  |  | (3) | (5) | 3
Less: effect of income taxes |  |  |  |  |  |  |  |  | (1) | (2) | 1
Other comprehensive (loss) income, net of tax |  |  |  |  |  |  |  |  | (2) | (3) | 2
Comprehensive income (loss) |  |  |  |  |  |  |  |  | $ 705 | $ (515) | $ 54

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