Quarterly report pursuant to Section 13 or 15(d)

Amount Recorded in Income Statements for Foreign Currency Forward Contracts Not Designated as Hedges (Detail)

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Amount Recorded in Income Statements for Foreign Currency Forward Contracts Not Designated as Hedges (Detail) (Not Designated as Hedging Instrument, USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Foreign Exchange Contracts | Other Operating Expense
       
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in Income $ (7) $ 11 $ 27 $ (2)
Foreign Exchange Contracts | Investment Income [Member]
       
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in Income (24) 0 (24) 0
Foreign Exchange Contracts | Revenue
       
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in Income 2 0 2 0
Interest Rate Swap Contract | Interest Expense
       
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Gain (Loss) Recognized in Income $ (6) $ 0 $ (11) $ 0