Deferred Policy Acquisition and Sales Inducement Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Deferred policy acquisition costs
Balance, beginning of year	$ 1,232	$ 1,156	$ 1,187
Acquisition costs deferred	55	78	122
Amortization charged to income	(180)	(146)	(152)
Effect of unrealized gains and losses	(160)	144	(46)
Reinsurance ceded	0	0	45
Balance, end of year	947	1,232	1,156
DSI activity relates to fixed annuities and interest-sensitive life contracts
Balance, beginning of year	34	36	40
Amortization charged to income	(5)	(4)	(4)
Effect of unrealized gains and losses	(2)	2	0
Balance, end of year	$ 27	$ 34	$ 36