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Derivatives and Hedging Activities (Details 2) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
After-tax change in AOCI resulting from cash flow hedges  
December 31, 2010 $ 8
2011 Hedging Activity 16
Reclassification of Gains to Net Income (26)
December 31, 2011 $ (2)