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Summary of Gains and Losses on Derivative Instruments (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (loss) recognized in OCI $ (106) $ 1 $ 3
Gains (losses) on hedging activities reclassified from AOCI to net income, before tax (8) 6 47
Gain (loss) recognized in income, fair value hedges 3 (9) 43
Other (income) expense, net | Not Designated as Hedging Instrument      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (loss) recognized in income, undesignated derivative instruments (20) 4 (13)
Cash Flow Hedges | Interest rate contract      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (loss) recognized in OCI (3)    
Cash Flow Hedges | Interest rate contract | Other (income) expense, net      
Derivative Instruments, Gain (Loss) [Line Items]      
Gains (losses) on hedging activities reclassified from AOCI to net income, before tax   9  
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 (24) 1 4
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 (8) (3) 47
Net investment hedge      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (loss) recognized in OCI (79)    
Fair value hedges | Net Interest Expense      
Derivative Instruments, Gain (Loss) [Line Items]      
Gain (loss) recognized in income, fair value hedges $ (3) $ 9 $ (43)