Investments (Details 22) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Components of Sales or Disposals of Fixed Maturity and Equity Securities
Proceeds	$ 19,805	$ 13,764	$ 36,653	$ 22,281
Gross investment gains	261	290	502	485
Gross investment losses	(266)	(196)	(505)	(337)
Total OTTI losses recognized in earnings:
Credit-related	(70)	(146)	(113)	(232)
Other	(100)	(1)	(186)	(8)
Fixed maturity securities other than temporary impairment losses recognized in earnings, net	(123)	(146)	(246)	(238)
Total OTTI losses recognized in earnings	(47)	(1)	(53)	(2)
Total OTTI losses recognized in earnings	(170)	(147)	(299)	(240)
Net investment gains (losses)	(175)	(53)	(302)	(92)
Common stock [Member]
Total OTTI losses recognized in earnings:
Total OTTI losses recognized in earnings	(9)	(1)	(15)	(2)
Fixed maturity securities [Member]
Components of Sales or Disposals of Fixed Maturity and Equity Securities
Proceeds	19,316	13,466	35,848	21,838
Gross investment gains	235	214	428	378
Gross investment losses	(217)	(195)	(450)	(333)
Total OTTI losses recognized in earnings:
Credit-related	(70)	(146)	(113)	(232)
Other	(53)	0	(133)	(6)
Fixed maturity securities other than temporary impairment losses recognized in earnings, net	(123)	(146)	(246)	(238)
Net investment gains (losses)	(105)	(127)	(268)	(193)
RMBS [Member]
Total OTTI losses recognized in earnings:
Fixed maturity securities other than temporary impairment losses recognized in earnings, net	(36)	(27)	(54)	(57)
ABS [Member]
Total OTTI losses recognized in earnings:
Fixed maturity securities other than temporary impairment losses recognized in earnings, net	(6)	(44)	(15)	(63)
Foreign government debt securities [Member]
Total OTTI losses recognized in earnings:
Fixed maturity securities other than temporary impairment losses recognized in earnings, net	(13)	0	(89)	0
CMBS [Member]
Total OTTI losses recognized in earnings:
Fixed maturity securities other than temporary impairment losses recognized in earnings, net	0	(51)	(3)	(61)
Equity Securities [Member]
Components of Sales or Disposals of Fixed Maturity and Equity Securities
Proceeds	489	298	805	443
Gross investment gains	26	76	74	107
Gross investment losses	(49)	(1)	(55)	(4)
Total OTTI losses recognized in earnings:
Credit-related	0	0	0	0
Other	(47)	(1)	(53)	(2)
Total OTTI losses recognized in earnings	(47)	(1)	(53)	(2)
Net investment gains (losses)	$ (70)	$ 74	$ (34)	$ 101