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Summary of Gains and Losses on Derivative Instruments (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) on hedging activities reclassified from AOCI to net income, before tax [1] $ 5 $ 25
Other income, net | Not Designated as Hedging Instrument    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) recognized in income, undesignated derivative instruments 6 (8)
Interest rate contract | Net Interest Expense    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) on hedging activities reclassified from AOCI to net income, before tax [1] 4  
Fair value hedges | Net Interest Expense    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) recognized in income, fair value hedges 22 47
Cash Flow Hedges    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) recognized in OCI (4) 63
Gains (losses) on hedging activities reclassified from AOCI to net income, before tax 5 25
Cash Flow Hedges | Interest rate contract | Other income, net    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) on hedging activities reclassified from AOCI to net income, before tax 4  
Cash Flow Hedges | Foreign Exchange Contracts One    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) recognized in OCI   (1)
Cash Flow Hedges | Foreign Exchange Contracts Two    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (loss) recognized in OCI (4) 64
Cash Flow Hedges | Foreign Exchange Contracts Two | Cost of Sales    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (losses) on hedging activities reclassified from AOCI to net income, before tax $ 1 $ 25
[1] Amounts in parentheses indicate reductions to net income.