Investments (Details 4) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Fixed Maturity Available-for-sale Securities by Contractual Maturity
Fixed Maturity Available for Sale Securities, Amortized Cost, Total	$ 248,180	$ 223,240
Bonds available for sale
Fixed Maturity Available-for-sale Securities by Contractual Maturity
Due in one year or less, Amortized Cost	10,270
Due after one year through five years, Amortized Cost	57,234
Due after five years through ten years, Amortized Cost	67,695
Due after ten years, Amortized Cost	63,832
Mortgage-backed, asset-backed and collateralized, Amortized Cost	47,359
Fixed Maturity Available for Sale Securities, Amortized Cost, Total	246,390	220,669
Due in one year or less, Fair Value	10,375
Due after one year through five years, Fair Value	59,506
Due after five years through ten years, Fair Value	72,002
Due after ten years, Fair Value	70,981
Mortgage-backed, asset-backed and collateralized, Fair Value	46,965
Fixed Maturity Available for Sale Securities, Fair Value, Total	259,829
Fixed Maturity Securities in a Loss Position
Fixed Maturity Available-for-sale Securities by Contractual Maturity
Due in one year or less, Amortized Cost	2,224
Due after one year through five years, Amortized Cost	11,774
Due after five years through ten years, Amortized Cost	12,548
Due after ten years, Amortized Cost	6,867
Mortgage-backed, asset-backed and collateralized, Amortized Cost	20,381
Fixed Maturity Available for Sale Securities, Amortized Cost, Total	53,794
Due in one year or less, Fair Value	2,201
Due after one year through five years, Fair Value	11,321
Due after five years through ten years, Fair Value	11,950
Due after ten years, Fair Value	6,210
Mortgage-backed, asset-backed and collateralized, Fair Value	17,524
Fixed Maturity Available for Sale Securities, Fair Value, Total	$ 49,206

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