Investments (Details 8) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Credit Losses on Fixed Income Securities
Balance	$ (513)	$ (617)	$ (944)
Additional credit loss for securities previously other-than-temporarily impaired	(6)	(30)	(58)
Additional credit loss for securities not previously other-than-temporarily impaired	(18)	(19)	(50)
Reduction in credit loss for securities disposed or collected	95	150	427
Reduction in credit loss for securities the Company has made the decision to sell or more likely than not will be required to sell		2	7
Change in credit loss due to accretion of increase in cash flows	3	1	1
Reduction in credit loss for securities sold in LBL disposition	59
Balance	(380)	(513)	(617)
Cumulative credit losses recognized in earnings for securities classified as held for sale		$ 60