Investments (Details 23) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Entity Sector Industry Classifications [Abstract]
Fixed maturity securities other than temporary impairment losses recognized in earnings, net	$ 123	$ 146	$ 246	$ 238
Fixed maturity securities [Member]
Entity Sector Industry Classifications [Abstract]
Fixed maturity securities other than temporary impairment losses recognized in earnings, net	123	146	246	238
Fixed maturity securities [Member] | Communications [Member]
Entity Sector Industry Classifications [Abstract]
Fixed maturity securities other than temporary impairment losses recognized in earnings, net	1	0	14	3
Fixed maturity securities [Member] | Consumer [Member]
Entity Sector Industry Classifications [Abstract]
Fixed maturity securities other than temporary impairment losses recognized in earnings, net	27	1	29	23
Fixed maturity securities [Member] | Utility [Member]
Entity Sector Industry Classifications [Abstract]
Fixed maturity securities other than temporary impairment losses recognized in earnings, net	0	3	1	3
Fixed maturity securities [Member] | Finance [Member]
Entity Sector Industry Classifications [Abstract]
Fixed maturity securities other than temporary impairment losses recognized in earnings, net	40	20	41	28
RMBS [Member]
Entity Sector Industry Classifications [Abstract]
Fixed maturity securities other than temporary impairment losses recognized in earnings, net	36	27	54	57
ABS [Member]
Entity Sector Industry Classifications [Abstract]
Fixed maturity securities other than temporary impairment losses recognized in earnings, net	6	44	15	63
Foreign government debt securities [Member]
Entity Sector Industry Classifications [Abstract]
Fixed maturity securities other than temporary impairment losses recognized in earnings, net	13	0	89	0
CMBS [Member]
Entity Sector Industry Classifications [Abstract]
Fixed maturity securities other than temporary impairment losses recognized in earnings, net	0	51	3	61
Corporate fixed maturity securities [Member]
Entity Sector Industry Classifications [Abstract]
Fixed maturity securities other than temporary impairment losses recognized in earnings, net	$ 68	$ 24	$ 85	$ 57