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Guarantees and Off-Balance Sheet Arrangements Guarantees (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Guarantees and Off Balance Sheet Arrangements [Abstract]
Guaranty Liabilities	$ 150

This item represents a non-contingent liability for the fair value of an obligation to stand ready to perform over the term of a guaranty issued in the event that specified triggering events or conditions occur.

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