Deferred Policy Acquisition and Sales Inducement Costs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Deferred policy acquisition costs
Balance, beginning of year	$ 1,156	$ 1,187	$ 1,314
Acquisition costs deferred	78	122	79
Amortization charged to income	(146)	(152)	(134)
Effect of unrealized gains and losses	144	(46)	(72)
Reinsurance ceded	0	45	0
Balance, end of year	1,232	1,156	1,187
DSI activity relates to fixed annuities and interest-sensitive life contracts
Balance, beginning of year	36	40	45
Sales inducements deferred	0	0	1
Amortization charged to income	(4)	(4)	(5)
Effect of unrealized gains and losses	2	0	(1)
Balance, end of year	$ 34	$ 36	$ 40