Investments (Details 6) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Other-than-temporary impairment losses by asset type
Total other-than-temporary impairment losses	$ (14)	$ (15)	$ (22)	$ (16)
Portion of loss recognized in other comprehensive income		(2)	(1)	(10)
Net other-than-temporary impairment losses recognized in earnings	(14)	(17)	(23)	(26)
Fixed income securities
Other-than-temporary impairment losses by asset type
Total other-than-temporary impairment losses	2	(1)	1	(26)
Portion of loss recognized in other comprehensive income		(2)	(1)	(10)
Net other-than-temporary impairment losses recognized in earnings	2	(3)		(36)
Municipal
Other-than-temporary impairment losses by asset type
Total other-than-temporary impairment losses		(1)	(1)	(8)
Net other-than-temporary impairment losses recognized in earnings		(1)	(1)	(8)
ABS
Other-than-temporary impairment losses by asset type
Total other-than-temporary impairment losses	(1)		(1)
Portion of loss recognized in other comprehensive income		(1)		(1)
Net other-than-temporary impairment losses recognized in earnings	(1)	(1)	(1)	(1)
RMBS
Other-than-temporary impairment losses by asset type
Total other-than-temporary impairment losses	3		3	1
Portion of loss recognized in other comprehensive income			(1)	(1)
Net other-than-temporary impairment losses recognized in earnings	3		2
CMBS
Other-than-temporary impairment losses by asset type
Total other-than-temporary impairment losses				(19)
Portion of loss recognized in other comprehensive income		(1)		(8)
Net other-than-temporary impairment losses recognized in earnings		(1)		(27)
Mortgage loans
Other-than-temporary impairment losses by asset type
Total other-than-temporary impairment losses		(9)	4	17
Net other-than-temporary impairment losses recognized in earnings		(9)	4	17
Equity securities
Other-than-temporary impairment losses by asset type
Total other-than-temporary impairment losses	(4)	(1)	(8)	(1)
Net other-than-temporary impairment losses recognized in earnings	(4)	(1)	(8)	(1)
Limited partnership interests
Other-than-temporary impairment losses by asset type
Total other-than-temporary impairment losses	(12)	(4)	(19)	(4)
Net other-than-temporary impairment losses recognized in earnings	(12)	(4)	(19)	(4)
Other
Other-than-temporary impairment losses by asset type
Total other-than-temporary impairment losses				(2)
Net other-than-temporary impairment losses recognized in earnings				$ (2)