Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 93	$ 115	$ 127	$ 160
Other comprehensive income (loss), before tax:
Unrealized gains (losses) on securities	1,269	498	309	1,131
Impairments	0	1	0	1
Pension and other postretirement benefits liability	(1)	(1)	(1)	(1)
Other comprehensive income (loss), before tax	1,268	498	308	1,131
Income tax expense (benefit) related to items of other comprehensive income (loss)	266	105	65	236
Other comprehensive income (loss), after tax	1,002	393	243	895
Comprehensive income (loss)	$ 1,095	$ 508	$ 370	$ 1,055