Investments (Details 5) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Investments
Impairment write-downs	$ (18)	$ (43)	$ (61)	$ (131)
Change in intent write-downs	(70)	(3)	(124)	(48)
Net other-than-temporary impairment losses recognized in earnings	(88)	(46)	(185)	(179)
Sales	59	(24)	639	275
Valuation of derivative instruments			(1)	1
Settlements of derivative instruments	(12)	(2)	(1)	26
Total realized capital gains and losses	(41)	(72)	452	123
Fixed income securities
Investments
Net other-than-temporary impairment losses recognized in earnings	(11)	(18)	(64)	(109)
Total realized capital gains and losses	24	(50)	175	(73)
Schedule of Available for Sale Securities
Gross gains on sales of fixed income securities	74	109	322	296
Gross loss on sales of fixed income securities	$ 39	$ 154	$ 83	$ 291