Investments (Details 8) (USD $) In Millions	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Other Than Temporary Impairment Credit Losses Recognized in Earnings
Balance at the beginning of the period	$ 6,540	$ 7,273	$ 6,786	$ 7,803
Increases due to:
Credit impairments on new securities subject to impairment losses	33	153	85	290
Additional credit impairments on previously impaired securities	85	343	235	811
Reduction due to:
Credit impaired securities fully disposed for which there was no prior intent or requirement to sell	(155)	(176)	(325)	(563)
Credit impaired securities for which there is a current intent or anticipated requirement to sell		(2)		(4)
Accretion on securities previously impaired due to credit	(107)	(91)	(207)	(186)
Hybrid securities with embedded credit derivatives reclassified to Bonds trading securities			(179)
Other		507	1	(144)
Balance at the end of the period	$ 6,396	$ 8,007	$ 6,396	$ 8,007

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