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Financial Instruments - Location and Pretax (Gains) or Loss Amounts for Derivatives (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]      
Sales $ 47,994 $ 46,840 $ 42,294
Other (income) expense, net (886) 139 (402)
Other comprehensive income (loss) (441) (648) (361)
Interest rate swap contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of (loss) gain recognized in OCI on derivatives (4) (6) (4)
Foreign exchange contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Amount of (loss) gain recognized in OCI on derivatives (383) 87 228
(Decrease) increase in Sales as a result of AOCI reclassifications 6 (255) 160
Other (income) expense, net | Interest rate swap contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Hedged items (40) (95) 27
Derivatives designated as hedging instruments 76 65 (50)
Amount of gain recognized in Other (income) expense, net on derivatives (4) (4) (4)
Reclassification out of Accumulated Other Comprehensive Income | Accumulated Gain (Loss), Cash Flow Hedge, Including Noncontrolling Interest | Foreign exchange contracts      
Derivative Instruments, Gain (Loss) [Line Items]      
Sales $ (6) $ 255 $ (160)