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Condensed Financial Information of Registrant - Condensed Statements of Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	$ 168	$ 175	$ 196	$ 198	$ 201	$ 197	$ 202	$ 107	$ 737	$ 707	$ (512)
Unrealized investment income (loss)									16	(3)	(5)
Less: effect of income taxes									4	(1)	(2)
Other comprehensive income (loss), net of tax									12	(2)	(3)
Comprehensive income (loss)									749	705	(515)
Parent Company
Condensed Financial Statements, Captions [Line Items]
Net income (loss)									737	707	(512)
Unrealized investment income (loss)									16	(3)	(5)
Less: effect of income taxes									4	(1)	(2)
Other comprehensive income (loss), net of tax									12	(2)	(3)
Comprehensive income (loss)									$ 749	$ 705	$ (515)

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