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Debt (Details) (USD $) In Millions, unless otherwise specified				3 Months Ended
	Mar. 31, 2012	Apr. 30, 2012 Interest Rate Contract [Member] Forward Swap [Member] New Contract [Member]	Mar. 31, 2012 Commercial Paper [Member]	Mar. 31, 2012 Term Loan Due 2012 [Member]
Debt Instrument [Line Items]
Extinguishment of Debt, Amount				$ 150
Commercial Paper	178
Short-term Debt, Weighted Average Interest Rate			0.40%
Notional Amount Of Derivatives		$ 150

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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