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Condensed Financial Information of Registrant - Condensed Statements of Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Condensed Financial Statements, Captions [Line Items]
Net income	$ 659	$ 673	$ 737
Statement of Other Comprehensive Income [Abstract]
Unrealized investment (loss) income	(55)	44	16
Less: effect of income taxes	(13)	11	4
Other comprehensive (loss) income, net of tax	(42)	33	12
Comprehensive income	617	706	749
Parent Company
Condensed Financial Statements, Captions [Line Items]
Net income	659	673	737
Statement of Other Comprehensive Income [Abstract]
Unrealized investment (loss) income	(55)	44	16
Less: effect of income taxes	(13)	11	4
Other comprehensive (loss) income, net of tax	(42)	33	12
Comprehensive income	$ 617	$ 706	$ 749

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