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Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income	$ 673	$ 737	$ 707
Other comprehensive income (loss):
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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