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Hedges of Net Investments in International Operations (Detail) (Net Investment Hedging, Currency Translation Adjustments, Currency exchange contracts, USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Euro Notes
       
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) recognized in OCI $ 219 $ (28) $ 219 $ (18)
Pound Sterling Notes
       
Derivative Instruments, Gain (Loss) [Line Items]        
Gains / (losses) recognized in OCI $ 37 $ (40) $ 14 $ 3