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Financial Instruments - Income Statement Effects on Derivatives Not Designated as Hedging Instruments (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Oct. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Derivative Instruments, Gain (Loss) [Line Items]          
Amount of Derivative Pretax (Gain) Loss Recognized in Income $ (6)        
Currency Swap | Other (income) expense, net          
Derivative Instruments, Gain (Loss) [Line Items]          
Amount of Derivative Pretax (Gain) Loss Recognized in Income   $ 18 $ (7) $ 234 $ (138)
Foreign Exchange Future | Sales          
Derivative Instruments, Gain (Loss) [Line Items]          
Amount of Derivative Pretax (Gain) Loss Recognized in Income   (4) 7 6 4
Interest Rate Contract | Other (income) expense, net          
Derivative Instruments, Gain (Loss) [Line Items]          
Amount of Derivative Pretax (Gain) Loss Recognized in Income   0 0 0 9
Forward Contracts | Research and development          
Derivative Instruments, Gain (Loss) [Line Items]          
Amount of Derivative Pretax (Gain) Loss Recognized in Income   $ 0 $ 22 $ 0 $ 22