Condensed Consolidated Statements of Comprehensive Income (unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 197	$ 317
Unrealized holding gains (losses) arising during the period on:
Investments with no other-than-temporary impairment, net of tax provision (benefit) of $(29) and $23	(122)	44
Investments with other-than-temporary impairment, net of tax provision (benefit) of $(3) and $28	(11)	50
Unrealized holding gains (losses) arising during the period, net of tax	(133)	94
Less: reclassification adjustment for gains (losses) included in net income (loss), net of tax provision (benefit) of $(2) and $21	(3)	39
Change in net unrealized gains (losses) on investments	(130)	55
Net unrealized gains (losses) on FG VIE liabilities with recourse attributable to instrument-specific credit risk arising during the period, net of tax provision (benefit) of $(1) (see Note 1)	(4)	0
Less: reclassification adjustment for gains (losses) included in net income (loss), net of tax provision (benefit) of $(1)	(2)	0
Change in net unrealized gains (losses) on FG VIE liabilities with recourse	(2)	0
Other, net of tax provision	6	2
Other comprehensive income (loss)	(126)	57
Comprehensive income (loss)	$ 71	$ 374