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Financial Instruments (Commercial Paper) (Details) (USD $)	Dec. 31, 2013	Feb. 28, 2013 Commercial Paper
Short-term Debt [Line Items]
Capacity of commercial paper program		$ 1,000,000,000
Commercial Paper	$ 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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