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Fair Value Hedges (Detail) (Fair Value Hedges, USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Interest Rate Contracts
       
Derivative Instruments, Gain (Loss) [Line Items]        
Gain / (loss) recognized in income on Derivatives $ (2) $ (3) $ (2) $ (3)
Debt
       
Derivative Instruments, Gain (Loss) [Line Items]        
Gain / (loss) recognized in income on Borrowings $ 2 $ 3 $ 2 $ 3