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Financial Instruments - Location and Pretax Gain or Loss Amounts for Derivatives (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Derivative Instruments, Gain (Loss) [Line Items]      
Ineffectiveness on the hedged item $ 5 $ 1 $ 7
Derivatives not designated in a hedging relationship | Foreign exchange contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of (gain) loss recognized in Other (income) expense, net on derivatives 110 132 (461)
Amount of gain recognized in Sales (3) 0 (1)
Derivatives designated in a fair value hedging relationship | Interest rate swap contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of (gain) loss recognized in Other (income) expense, net on derivatives 43 28 (14)
Amount of loss (gain) recognized in Other (income) expense, net on hedged item (48) (29) 7
Derivatives designated in foreign currency cash flow hedging relationships | Foreign exchange contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of gain reclassified from AOCI to Sales (138) (311) (724)
Amount of loss (gain) recognized in OCI on derivatives 561 (210) (526)
Derivatives designated in foreign currency net investment hedging relationships | Foreign exchange contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of gain recognized in Other (income) expense, net on derivatives 0 (1) (4)
Amount of loss (gain) recognized in OCI on derivatives $ 0 $ 2 $ (10)