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Financial Instruments - Income Statement Effects on Derivatives Not Designated as Hedging Instruments (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Foreign currency | Other (income) expense, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Derivative Pretax (Gain) Loss Recognized in Income $ 167 $ 49 $ 217 $ (131)
Forecasted transactions | Sales        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Derivative Pretax (Gain) Loss Recognized in Income 14 4 10 (3)
Interest Rate Contract | Other (income) expense, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Amount of Derivative Pretax (Gain) Loss Recognized in Income $ 0 $ 9 $ 0 $ 9