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Derivative Instruments and Hedging Activities (Details Textual) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Derivative Instrument and Hedging Activities (Textual) [Abstract]
Forecasted debt issuance variable rate period	3-month LIBOR
Percentage of interest rate swap effectiveness			100.00%
Interest rate swap recorded in other comprehensive income			$ 23
Increase Decrease in Interest expense due to amortization of gain on discontinuation of interest rate swap agreement	3	3
Ineffective portion of the cash flow hedges	2
Loss from the termination of the interest rate swap agreement	23
Issued notes	$ 400

The effective portion of gains on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

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- Definition

The portion of losses on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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