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Condensed Financial Information of Registrant - Condensed Statements of Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items] |  |  |
Net income | $ 673 | $ 737 | $ 707
Statement of Other Comprehensive Income [Abstract] |  |  |
Unrealized investment income (loss) | 44 | 16 | (3)
Less: effect of income taxes | 11 | 4 | (1)
Other comprehensive income (loss), net of tax | 33 | 12 | (2)
Comprehensive income | 706 | 749 | 705
Parent Company |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Net income | 673 | 737 | 707
Statement of Other Comprehensive Income [Abstract] |  |  |
Unrealized investment income (loss) | 44 | 16 | (3)
Less: effect of income taxes | 11 | 4 | (1)
Other comprehensive income (loss), net of tax | 33 | 12 | (2)
Comprehensive income | $ 706 | $ 749 | $ 705

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