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Derivatives and Hedging Activities (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012
After-tax change in AOCI resulting from cash flow hedges
December 31, 2011	$ (2)
2012 Hedging Activity	18
Reclassification of Gains to Net Income	(6)
March 31, 2012	$ 10

Net of tax effect change in accumulated gains and losses from derivative instruments designated and qualifying as the effective portion of cash flow hedges after taxes. A cash flow hedge is a hedge of the exposure to variability in the cash flows of a recognized asset or liability or a forecasted transaction that is attributable to a particular risk. The change includes an entity's share of an equity investee's increase (decrease) in deferred hedging gains or losses.

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