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Financial Instruments - Economic Hedges (Details) - Economic Hedging - Derivatives Not Designated as Hedging Instruments - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]    
Derivatives instruments, pre-tax gains/(losses) recognized in earnings $ 141 $ (80)
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 2
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 (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 (7) (17)
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 (3) (1)
Commodity contracts | Cost of sales    
Derivative Instruments, Gain (Loss) [Line Items]    
Derivatives instruments, pre-tax gains/(losses) recognized in earnings $ 149 $ (62)