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Derivatives and Hedging Activities (Details 2) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Cash flow hedges [Member] | Interest Expense [Member] | Interest rate contracts [Member]
     
Derivative Instruments, Gain (Loss) [Line Items]      
Amount reclassified from AOCI into income $ (13) $ (36) $ (115)
Cash flow hedges [Member] | Other Expense [Member] | Interest rate contracts [Member]
     
Derivative Instruments, Gain (Loss) [Line Items]      
Net hedge ineffectiveness 0 0 0
Net investment hedges [Member] | Other Expense [Member] | Foreign exchange contracts [Member]
     
Derivative Instruments, Gain (Loss) [Line Items]      
Amount reclassified from AOCI into income 0 2 0
Net hedge ineffectiveness $ (3) $ (3) $ (1)