Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ (94)	$ 97	$ 33	$ 257
Other comprehensive income (loss), before tax:
Unrealized gains (losses) on securities	95	286	404	1,417
Impairments	0	0	0	1
Pension and other postretirement benefits liability	0	0	(1)	(1)
Other comprehensive income (loss), before tax	95	286	403	1,417
Income tax expense (benefit) related to items of other comprehensive income (loss)	20	60	85	296
Other comprehensive income (loss), after tax	75	226	318	1,121
Comprehensive income (loss)	$ (19)	$ 323	$ 351	$ 1,378