Investments (Details 3) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Fixed Maturity Available-for-sale Securities by Contractual Maturity
Fixed Maturity Available for Sale Securities, Amortized Cost, Total	$ 240,848	$ 223,240
Fixed Maturity Available for Sale Securities, Fair Value, Total	249,360
Bonds available for sale
Fixed Maturity Available-for-sale Securities by Contractual Maturity
Due in one year or less, Amortized Cost	9,925
Due after one year through five years, Amortized Cost	54,633
Due after five years through ten years, Amortized Cost	63,815
Due after ten years, Amortized Cost	64,851
Mortgage-backed, asset-backed and collateralized, Amortized Cost	45,866
Fixed Maturity Available for Sale Securities, Amortized Cost, Total	239,090	220,669
Due in one year or less, Fair Value	10,112
Due after one year through five years, Fair Value	57,204
Due after five years through ten years, Fair Value	67,248
Due after ten years, Fair Value	69,262
Mortgage-backed, asset-backed and collateralized, Fair Value	45,534
Fixed Maturity Available for Sale Securities, Fair Value, Total	249,360
Fixed Maturity Securities in a Loss Position
Fixed Maturity Available-for-sale Securities by Contractual Maturity
Due in one year or less, Amortized Cost	1,357
Due after one year through five years, Amortized Cost	9,131
Due after five years through ten years, Amortized Cost	12,087
Due after ten years, Amortized Cost	12,862
Mortgage-backed, asset-backed and collateralized, Amortized Cost	21,047
Fixed Maturity Available for Sale Securities, Amortized Cost, Total	56,484
Due in one year or less, Fair Value	1,331
Due after one year through five years, Fair Value	8,915
Due after five years through ten years, Fair Value	11,775
Due after ten years, Fair Value	12,169
Mortgage-backed, asset-backed and collateralized, Fair Value	18,714
Fixed Maturity Available for Sale Securities, Fair Value, Total	$ 52,904

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