Consolidated Variable Interest Entities - Effect of Consolidating FG VIE's on Financial Information (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Variable Interest Entity [Line Items]
Net earned premiums	[1]	$ 214	$ 219	$ 397	$ 361
Net investment income		98	98	197	199
Net realized investment gains (losses)		10	(9)	(3)	7
Fair value gains (losses) on FG VIEs		4	5	22	(2)
Bargain purchase gain		0	2	0	2
Loss and LAE		102	188	192	206
Income (loss) before income taxes		201	409	266	675
Provision (benefit) for income taxes		55	112	61	177
Net income (loss)		146	297	205	498
Net cash flows provided by (used in) operating activities				(47)	105
Effect on shareholders' equity (decrease) increase		6,250		6,250		$ 6,063
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Net earned premiums		(3)	(5)	(8)	(10)
Net investment income		(2)	(3)	(7)	(6)
Net realized investment gains (losses)		0	3	1	3
Fair value gains (losses) on FG VIEs		4	5	22	(2)
Loss and LAE		(2)	2	4	7
Income (loss) before income taxes		(3)	4	12	(6)
Provision (benefit) for income taxes		(1)	1	4	(3)
Net income (loss)		(2)	3	8	(3)
Net cash flows provided by (used in) operating activities		(1)	$ 15	5	$ 33
Effect on shareholders' equity (decrease) increase		$ (12)		$ (12)		$ (23)

[1] Excludes $3 million and $5 million for Second Quarter 2016 and 2015, respectively, and $8 million and $10 million for Six Months 2016 and 2015, respectively, related to consolidated FG VIEs.