Reserves for Future Policy Benefits (Details) - Annuaitization Benefit - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward]
Beginning Balance	$ 635	$ 642
Incurred	74	63
Paid	67	77
Change in unrealized investment gains and losses	8	17
Ending Balance	650	645
Movement in Liabilities for Guarantees on Long-Duration Contracts, Reinsurance Recoverable [Roll Forward]
Beginning Balance	31	27
Incurred	(2)	2
Paid	0	0
Ending Balance	$ 29	$ 29