Reserve for Future Policy Benefits (Details) - Annuitization Benefit - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Liability
Beginning balance	$ 642	$ 713
Incurred	86	72
Paid	(102)	(101)
Change in unrealized investment gains and losses	9	(42)
Ending balance	635	642
Reinsurance Recoverable Asset
Beginning balance	27	26
Incurred	4	1
Paid	0	0
Ending balance	$ 31	$ 27