Investments (Details Textuals 1) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]
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
Redeemable preferred stock [Member]
Schedule of Available-for-sale Securities [Line Items]
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)	$ 2,000	$ 2,700

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

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+ Details