Investments (Details 5) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Investments
Impairment write-downs	$ (72)	$ (185)	$ (496)
Change in intent write-downs	(143)	(48)	(100)
Net other-than-temporary impairment losses recognized in earnings	(215)	(233)	(596)
Sales	819	536	1,336
Valuation of derivative instruments	(6)	(11)	(291)
Settlements of derivative instruments	(4)	35	(105)
EMA limited partnership income			159
Total realized capital gains and losses	594	327	503
Fixed income securities
Investments
Net other-than-temporary impairment losses recognized in earnings	(67)	(144)	(394)
Total realized capital gains and losses	262	107	712
Schedule of Available for Sale Securities
Gross gains on sales of fixed income securities	432	564	1,270
Gross loss on sales of fixed income securities	$ 103	$ 322	$ 240