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Financial Instruments - Location and Amount of Pretax (Gains) Losses of Derivatives (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]        
Sales $ 13,154 $ 10,929 $ 35,183 $ 30,570
Other (income) expense, net (450) (312) (1,007) (637)
Other comprehensive income (loss) 38 10 1,595 (190)
Interest rate swap contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized in OCI on derivatives 0 (1) (2) (3)
Interest rate swap contracts | Other (income) expense, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Hedged items (9) (14) (29) 54
Derivatives designated as hedging instruments (1) 0 (1) (76)
Amount of gain recognized in Other (income) expense, net on derivatives 0 (1) (2) (3)
Foreign exchange contracts        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of gain (loss) recognized in OCI on derivatives 72 (195) 193 (126)
(Decrease) increase in Sales as a result of AOCL reclassifications 36 23 219 (65)
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 $ (36) $ (23) $ (219) $ 65