Investments (Details 38) (USD $) In Millions	Jun. 30, 2011	Dec. 31, 2010
Fixed maturity securities [Member]
The following table provides the purchased credit impaired investments, by invested asset class, held
Outstanding principal and interest balance	$ 3,360	$ 1,548
Carrying value	2,377	1,050
Mortgage loans, net [Member]
The following table provides the purchased credit impaired investments, by invested asset class, held
Outstanding principal and interest balance	510	504
Carrying value	$ 205	$ 195

For loans accounted for as available-for-sale debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable, that have a net carrying amount, the undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loan, owed to the investor at the reporting date, whether or not currently due and whether or not any such amounts have been written or charged off by the investor. Amounts forgiven in a debt restructuring but contingently payable to the investor should be included in the forgiven contract balance, but amounts irrevocably forgiven in a debt restructuring should not be included. Amounts payable to the investor in cash, in kind, and by any other means should be included. Amounts legally discharged should not be included. The outstanding balance does not include amounts that would be accrued under the contract as interest, fees, penalties, and other after the reporting date.

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For loans not accounted for as debt securities, with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable, that have a net carrying amount, the undiscounted sum of all amounts, including amounts deemed principal, interest, fees, penalties, and other under the loan, owed to the investor at the reporting date, whether or not currently due and whether or not any such amounts have been written or charged off by the investor. Amounts forgiven in a debt restructuring but contingently payable to the investor should be included in the forgiven contract balance, but amounts irrevocably forgiven in a debt restructuring should not be included. Amounts payable to the investor in cash, in kind, and by any other means should be included. Amounts legally discharged should not be included. The outstanding balance does not include amounts that would be accrued under the contract as interest, fees, penalties, and other after the reporting date.

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