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Investments (Details 17) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Investments [Abstract]
Invested assets on deposit	$ 2,362	$ 1,660
Invested assets held in trust	12,434	11,135
Invested assets pledged as collateral	23,251	29,899
Total invested assets on deposit, held in trust and pledged as collateral	$ 38,047	$ 42,694

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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