Condensed Consolidated Statements of Comprehensive Income (unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Investments with no other-than-temporary impairment, tax provision (benefit)	$ (11)	$ 10	$ (42)	$ 63
Investments with other-than-temporary impairment, tax provision (benefit)	(3)	(7)	(5)	44
Reclassification adjustment for gains (losses) included in net income (loss), tax provision (benefit) - investments	0	3	(2)	29
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	(1)	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