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Financing Arrangements (Notes Payable) (Details) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Notes Payable [Abstract]
Short-term Debt, Weighted Average Interest Rate	3.51%	2.50%
Commercial Paper	$ 0	$ 0

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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