Consolidated Variable Interest Entities - Effect of Consolidating FG VIE's on Financial Information (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Variable Interest Entity [Line Items]
Net earned premiums	[1]	$ 231	$ 213	$ 628	$ 574
Net investment income		94	112	291	311
Net realized investment gains (losses)		(2)	(27)	(5)	(20)
Fair value gains (losses) on FG VIEs		(11)	2	11	0
Loss and LAE		9	(112)	(183)	(318)
Income (loss) before income taxes		480	172	746	847
Less: tax provision (benefit)		1	43	62	220
Net income (loss)		479	129	684	627
Net cash flows provided by (used in) operating activities				(190)	(39)
Effect on shareholders' equity (decrease) increase		6,640		6,640		$ 6,063
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Net earned premiums		(4)	(6)	(12)	(16)
Net investment income		(1)	(3)	(8)	(9)
Net realized investment gains (losses)		0	6	1	9
Fair value gains (losses) on FG VIEs		(11)	2	11	0
Bargain purchase gain		0	0	0	2
Loss and LAE		(1)	11	3	18
Income (loss) before income taxes		(17)	10	(5)	4
Less: tax provision (benefit)		(6)	4	(2)	1
Net income (loss)		(11)	6	(3)	3
Net cash flows provided by (used in) operating activities		11	$ 11	16	$ 44
Effect on shareholders' equity (decrease) increase		$ (25)		$ (25)		$ (23)

[1] Excludes $4 million and $6 million for Third Quarter 2016 and 2015, respectively, and $12 million and $16 million for Nine Months 2016 and 2015, respectively, related to consolidated FG VIEs.