Reserves for Future Policy Benefits (Details) - Annuaitization Benefit - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward]
Beginning Balance	$ 635	$ 642
Incurred	53	44
Paid	42	55
Change in unrealized investment gains and losses	6	13
Ending Balance	652	644
Movement in Liabilities for Guarantees on Long-Duration Contracts, Reinsurance Recoverable [Roll Forward]
Beginning Balance	31	27
Incurred	(4)	0
Paid	0	0
Ending Balance	$ 27	$ 27