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Investments (Invested Assets on Deposit, Held In Trust and Pledged as Collateral) (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Investments [Abstract]
Invested assets on deposit	$ 2,457	$ 2,362
Invested assets held in trust	11,153	12,434
Invested assets pledged as collateral	22,834	23,251
Total invested assets on deposit, held in trust and pledged as collateral	$ 36,444	$ 38,047

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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