Deferred Acquisition Costs and Deferred Sales Inducement Costs (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Balances of and changes in DAC
Balance at the beginning of the period	$ 2,673	$ 2,742
Capitalization of acquisition costs	57	54
Amortization	(503)	(2)
Impact of change in net unrealized (gains) losses on securities	118	(59)
Balance at the end of the period	2,345	2,735
Balances of and changes in DSIC
Balance at the beginning of the period	216	249
Amortization	(36)	0
Impact of change in net unrealized (gains) losses on securities	15	(10)
Balance at the end of the period	$ 195	$ 239