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Debt (Debt With Contractual Term Less Than One Year) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Debt [Abstract]
Unsecured commercial paper	$ 838,486	$ 480,472

Carrying value as of the balance sheet date of short-term borrowings using unsecured obligations issued by banks, corporations and other borrowers to investors. The maturities of these money market securities generally do not exceed 270 days.

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