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Financial Instruments - Location and Amount of Pretax (Gains) Losses of Derivatives (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Derivative Instruments, Gain (Loss) [Line Items]    
Sales $ 12,057 $ 10,816
Other (income) expense, net 71 188
Other comprehensive income (loss) (198) 199
Interest rate swap contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of gain (loss) recognized in OCI on derivatives (1) (4)
Interest rate swap contracts | Other (income) expense, net    
Derivative Instruments, Gain (Loss) [Line Items]    
Hedged items 67 33
Derivatives designated as hedging instruments (67) (23)
Amount of gain recognized in Other (income) expense, net on derivatives (1) (1)
Foreign exchange contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of gain (loss) recognized in OCI on derivatives 178 (13)
Increase (decrease) in Sales as a result of AOCI reclassifications (46) (44)
Foreign exchange contracts | Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest    
Derivative Instruments, Gain (Loss) [Line Items]    
Sales $ 46 $ 44