Investments (Details 7) (USD $) In Millions	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Other Than Temporary Impairment Credit Losses Recognized in Earnings
Balance at the beginning of the period	$ 6,396	$ 8,007	$ 6,786	$ 7,803
Increases due to:
Credit impairments on new securities subject to impairment losses	169	142	254	432
Additional credit impairments on previously impaired securities	222	278	457	1,088
Reduction due to:
Credit impaired securities fully disposed for which there was no prior intent or requirement to sell	(133)	(227)	(458)	(791)
Credit impaired securities for which there is a current intent or anticipated requirement to sell		(493)		(498)
Accretion on securities previously impaired due to credit	(148)	(83)	(355)	(269)
Hybrid securities with embedded credit derivatives reclassified to Bond trading securities		(748)	(179)	(748)
Other		(181)	1	(322)
Balance at the end of the period	$ 6,506	$ 6,695	$ 6,506	$ 6,695

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