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Financial Instruments - Economic Hedges (Details) - Derivatives Not Designated as Hedging Instruments - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives instruments, pre-tax gains/(losses) recognized in earnings $ (53) $ (30) $ 118 $ (183)
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 16 (13) 30 (8)
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 (1) 1 (6) (1)
Currency exchange contracts | Forecasted transactions | Cost of sales        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives instruments, pre-tax gains/(losses) recognized in earnings 53 (1) 118 0
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 2 0 (2) 2
Commodity contracts | Cost of sales        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives instruments, pre-tax gains/(losses) recognized in earnings $ (123) $ (17) $ (22) $ (176)