Consolidated Variable Interest Entities - Effect of Consolidating FG VIE's on Financial Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Variable Interest Entity [Line Items]
Net earned premiums	$ 158	$ 144	$ 136	$ 132	$ 182	$ 159	$ 163	$ 248	$ 570	$ 752	$ 853
Net investment income	102	102	96	103	107	99	93	94	403	393	404
Net realized investment gains (losses)	(35)	(19)	(8)	2	29	(7)	2	28	(60)	52	1
Fair value gains (losses) on FG VIEs	23	50	25	157	93	40	143	70	255	346	191
Other income (loss)	(3)	(11)	7	21	(5)	16	(7)	(14)	14	(10)	108
Loss and LAE	72	(44)	57	41	85	55	62	(48)	126	154	504
Income (loss) before income taxes	756	488	218	69	489	536	329	(212)	1,531	1,142	132
Provision (benefit) for income taxes	224	133	59	27	140	152	110	(68)	443	334	22
Net income (loss)	532	355	159	42	349	384	219	(144)	1,088	808	110
Net cash flows provided by (used in) operating activities									577	244	(165)
Effect on shareholders’ equity (decrease) increase	5,758				5,115				5,758	5,115	4,994	4,652
Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Net earned premiums									(32)	(60)	(153)
Net investment income									(11)	(13)	(13)
Net realized investment gains (losses)									(5)	2	4
Fair value gains (losses) on FG VIEs									255	346	191
Other income (loss)									(2)	0	0
Loss and LAE									30	21	65
Income (loss) before income taxes									235	296	94
Provision (benefit) for income taxes									82	103	32
Net income (loss)									153	193	62
Net cash flows provided by (used in) operating activities									68	(136)	166
Effect on shareholders’ equity (decrease) increase	$ (44)				$ (172)				$ (44)	$ (172)