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Derivatives and Hedging Activities (Details 2) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash Flow Hedging [Member] | Interest Expense [Member] | Interest Rate Contract [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Amount reclassified from AOCI into income $ 0 $ 0
Cash Flow Hedging [Member] | Other Expense [Member] | Interest Rate Contract [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Net hedge ineffectiveness 0 0
Net Investment Hedging [Member] | Other Expense [Member] | Foreign exchange contracts [Member]
   
Derivative Instruments, Gain (Loss) [Line Items]    
Amount reclassified from AOCI into income 0 0
Net hedge ineffectiveness $ 0 $ 0