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Investments (Details 28) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Investments [Abstract]
Invested assets on deposit	$ 1,660	$ 2,110
Invested assets held in trust	11,135	8,430
Invested assets pledged as collateral	29,899	29,470
Total invested assets on deposit, held in trust and pledged as collateral	$ 42,694	$ 40,010

The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations.

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