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Financial Instruments - Location and Amount of Pretax (Gains) Losses of Derivatives (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]        
Sales $ 11,402 $ 9,353 $ 22,029 $ 19,641
Other (income) expense, net (103) (387) (558) (325)
Other comprehensive income (loss) 1,545 (2) 1,557 (200)
Interest rate swap contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain recognized in OCI on derivatives 0 (1) (1) (2)
Interest rate swap contracts | Other (income) expense, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Hedged items (9) 1 (19) 68
Derivatives designated as hedging instruments (1) (8) 0 (76)
Amount of gain recognized in Other (income) expense, net on derivatives 0 (1) (1) (2)
Foreign exchange contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain recognized in OCI on derivatives (58) (109) 121 69
(Decrease) increase in Sales as a result of AOCI reclassifications 71 (42) 183 (88)
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 $ (71) $ 42 $ (183) $ 88