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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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