Investments (Details 11) (USD $) In Millions, unless otherwise specified	Jun. 30, 2011	Dec. 31, 2010
Asset Backed Securities
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $330,903 and $317,617, respectively; includes $3,357 and $3,330, respectively, relating to variable interest entities)	$ 341,744	$ 324,797
Fixed maturity securities [Member]
Asset Backed Securities
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $330,903 and $317,617, respectively; includes $3,357 and $3,330, respectively, relating to variable interest entities)	341,744	324,797
% of Total	100.00%	100.00%
ABS by collateral type [Member]
Asset Backed Securities
% of Total	100.00%	100.00%
ABS by collateral type [Member] | Portion rated NAIC 1 [Member]
Asset Backed Securities
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $330,903 and $317,617, respectively; includes $3,357 and $3,330, respectively, relating to variable interest entities)	13,683	13,133
% of Total	92.10%	91.90%
ABS by collateral type [Member] | Credit card loans [Member]
Asset Backed Securities
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $330,903 and $317,617, respectively; includes $3,357 and $3,330, respectively, relating to variable interest entities)	5,202	6,027
% of Total	35.00%	42.20%
ABS by collateral type [Member] | Student loans [Member]
Asset Backed Securities
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $330,903 and $317,617, respectively; includes $3,357 and $3,330, respectively, relating to variable interest entities)	2,903	2,416
% of Total	19.50%	16.90%
ABS by collateral type [Member] | Collateralized debt obligations [Member]
Asset Backed Securities
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $330,903 and $317,617, respectively; includes $3,357 and $3,330, respectively, relating to variable interest entities)	2,447	1,798
% of Total	16.50%	12.60%
ABS by collateral type [Member] | RMBS backed by sub-prime mortgage loans [Member]
Asset Backed Securities
% of Total	7.20%	7.80%
ABS by collateral type [Member] | Automobile loans [Member]
Asset Backed Securities
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $330,903 and $317,617, respectively; includes $3,357 and $3,330, respectively, relating to variable interest entities)	836	605
% of Total	5.60%	4.20%
ABS by collateral type [Member] | Other loans [Member]
Asset Backed Securities
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $330,903 and $317,617, respectively; includes $3,357 and $3,330, respectively, relating to variable interest entities)	2,404	2,322
% of Total	16.20%	16.30%
ABS by collateral type [Member] | Portion rated Aaa/AAA [Member]
Asset Backed Securities
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $330,903 and $317,617, respectively; includes $3,357 and $3,330, respectively, relating to variable interest entities)	9,809	10,411
% of Total	66.00%	72.90%
RMBS backed by sub-prime mortgage loans [Member] | ABS [Member]
Asset Backed Securities
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $330,903 and $317,617, respectively; includes $3,357 and $3,330, respectively, relating to variable interest entities)	1,065	1,119
ABS [Member]
Asset Backed Securities
Fixed maturity securities available-for-sale, at estimated fair value (amortized cost: $330,903 and $317,617, respectively; includes $3,357 and $3,330, respectively, relating to variable interest entities)	$ 14,857	$ 14,287
% of Total	4.40%	4.40%