Investments (Details 2) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Summary of Certain Fixed Maturity Securities
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $334,009 and $317,617, respectively; includes $3,265 and $3,330, respectively, relating to variable interest entities)	$ 353,927	$ 324,797
Below investment grade or non-rated fixed maturity securities [Member]
Summary of Certain Fixed Maturity Securities
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $334,009 and $317,617, respectively; includes $3,265 and $3,330, respectively, relating to variable interest entities)	24,494	24,870
Net unrealized gain (loss)	(1,683)	(696)
Non-income producing fixed maturity securities [Member]
Summary of Certain Fixed Maturity Securities
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $334,009 and $317,617, respectively; includes $3,265 and $3,330, respectively, relating to variable interest entities)	145	130
Net unrealized gain (loss)	$ (54)	$ (23)

For an unclassified balance sheet, total of debt securities categorized neither as held-to-maturity nor trading.

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+ Details