Investments (Details 6) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Other-than-temporary impairment losses by asset type
Total other-than-temporary impairment losses	$ (49)	$ (60)	$ (279)
Portion of loss recognized in other comprehensive income	(3)	(8)	(14)
Net other-than-temporary impairment losses recognized in earnings	(52)	(68)	(293)
Fixed income securities
Other-than-temporary impairment losses by asset type
Total other-than-temporary impairment losses	(42)	(61)	(227)
Portion of loss recognized in other comprehensive income	(3)	(8)	(14)
Net other-than-temporary impairment losses recognized in earnings	(45)	(69)	(241)
Municipal
Other-than-temporary impairment losses by asset type
Total other-than-temporary impairment losses	(8)		(14)
Portion of loss recognized in other comprehensive income			(3)
Net other-than-temporary impairment losses recognized in earnings	(8)		(17)
Corporate
Other-than-temporary impairment losses by asset type
Total other-than-temporary impairment losses		(16)	(28)
Portion of loss recognized in other comprehensive income		(2)	6
Net other-than-temporary impairment losses recognized in earnings		(18)	(22)
ABS
Other-than-temporary impairment losses by asset type
Total other-than-temporary impairment losses			(8)
Portion of loss recognized in other comprehensive income	(2)		2
Net other-than-temporary impairment losses recognized in earnings	(2)		(6)
RMBS
Other-than-temporary impairment losses by asset type
Total other-than-temporary impairment losses	(2)	(23)	(111)
Portion of loss recognized in other comprehensive income	2	(9)	(20)
Net other-than-temporary impairment losses recognized in earnings		(32)	(131)
CMBS
Other-than-temporary impairment losses by asset type
Total other-than-temporary impairment losses	(32)	(22)	(66)
Portion of loss recognized in other comprehensive income	(3)	3	1
Net other-than-temporary impairment losses recognized in earnings	(35)	(19)	(65)
Mortgage loans
Other-than-temporary impairment losses by asset type
Total other-than-temporary impairment losses	11	5	(33)
Net other-than-temporary impairment losses recognized in earnings	11	5	(33)
Equity securities
Other-than-temporary impairment losses by asset type
Total other-than-temporary impairment losses	(6)	(1)	(5)
Net other-than-temporary impairment losses recognized in earnings	(6)	(1)	(5)
Limited partnership interests
Other-than-temporary impairment losses by asset type
Total other-than-temporary impairment losses	(9)	(3)	(3)
Net other-than-temporary impairment losses recognized in earnings	(9)	(3)	(3)
Other
Other-than-temporary impairment losses by asset type
Total other-than-temporary impairment losses	(3)		(11)
Net other-than-temporary impairment losses recognized in earnings	$ (3)		$ (11)