Condensed Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Investments with no other-than-temporary impairment, tax provision (benefit)	$ (2)	$ 30	$ (31)	$ 53
Investments with other-than-temporary impairment, tax provision (benefit)	1	23	2	51
Reclassification adjustment for gains (losses) included in net income (loss), tax provision (benefit) - investments	0	5	(2)	26
Net unrealized gains (losses) on FG VIEs' liabilities with recourse attributable to instrument-specific credit risk arising during the period, , net of tax provision (benefit)	1	0	0	0
Reclassification adjustment for gains (losses) included in net income (loss), net of tax provision (benefit) - FG VIEs' liabilities with recourse	$ 0	$ 0	$ (1)	$ 0