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Financial Instruments - Economic Hedges (Details) - Economic Hedging - Derivatives Not Designated as Hedging Instruments - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives instruments, pre-tax gains/(losses) recognized in earnings $ 30 $ (73) $ 171 $ (153)
Currency exchange contracts | Intercompany loans and forecasted interest payments | Interest and other expense, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives instruments, pre-tax gains/(losses) recognized in earnings 7 3 14 5
Currency exchange contracts | Forecasted transactions | Interest and other expense, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives instruments, pre-tax gains/(losses) recognized in earnings 0 1 (5) (2)
Currency exchange contracts | Forecasted transactions | Cost of sales        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives instruments, pre-tax gains/(losses) recognized in earnings 72 18 65 2
Currency exchange contracts | Forecasted transactions | Selling, general and administrative expenses        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives instruments, pre-tax gains/(losses) recognized in earnings (1) 2 (4) 2
Commodity contracts | Cost of sales        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives instruments, pre-tax gains/(losses) recognized in earnings $ (48) $ (97) $ 101 $ (160)