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Financial Instruments - Location and Amount of Pretax (Gains) Losses of Derivatives (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]    
Sales $ 12,080 $ 12,057
Other (income) expense, net (448) 71
Other comprehensive income (loss) 12 (198)
Interest rate swap contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Amount of gain recognized in OCI on derivatives (1) (1)
Interest rate swap contracts | Other (income) expense, net    
Derivative Instruments, Gain (Loss) [Line Items]    
Hedged items (11) 67
Derivatives designated as hedging instruments 1 (67)
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 recognized in OCI on derivatives 180 178
(Decrease) increase in Sales as a result of AOCI reclassifications 112 (46)
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 $ (112) $ 46