Investments (Details 12) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Available-for-sale Securities, Debt Maturities [Abstract]
Amortized Cost, Due in one year or less	$ 13,713	$ 8,580
Amortized Cost, Due after one year through five years	68,498	65,143
Amortized Cost, Due after five years through ten years	83,338	76,508
Amortized Cost, Due after ten years	93,637	87,983
Amortized Cost, Subtotal	259,186	238,214
Amortized Cost, RMBS, CMBS and ABS	74,823	79,403
Amortized cost of fixed maturity securities available-for-sale	334,009	317,617
Estimated Fair Value, Due in one year or less	13,813	8,702
Estimated Fair Value, Due after one year through five years	70,234	66,796
Estimated Fair Value, Due after five years through ten years	88,497	79,571
Estimated Fair Value, Due after ten years	105,487	90,033
Estimated Fair Value, Subtotal	278,031	245,102
Estimated Fair Value, RMBS, CMBS and ABS	75,896	79,695
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