Consolidated Variable Interest Entities - Effect of Consolidating FG VIE's on Financial Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Variable Interest Entity [Line Items]
Net earned premiums	$ 164	$ 183
Net investment income	122	99
Net realized investment gains (losses)	32	(13)
Fair value gains (losses) on FG VIEs	10	18
Loss and LAE	(59)	(90)
Income (loss) before income taxes	372	65
Less: tax provision (benefit)	55	6
Net income (loss)	317	59
Net cash flows provided by (used in) operating activities	102	(90)
Effect on shareholders' equity (decrease) increase	6,637		$ 6,504
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Net earned premiums	(4)	(5)
Net investment income	(1)	(5)
Net realized investment gains (losses)	0	1
Fair value gains (losses) on FG VIEs	10	18
Loss and LAE	2	6
Income (loss) before income taxes	7	15
Less: tax provision (benefit)	3	5
Net income (loss)	4	10
Net cash flows provided by (used in) operating activities	5	$ 6
Effect on shareholders' equity (decrease) increase	$ (4)		$ (9)