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Financial Instruments - Economic Hedges (Details) - Derivatives Not Designated as Hedging Instruments - 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]        
Derivatives instruments, pre-tax gains/(losses) recognized in earnings $ 176 $ 176 $ 470 $ (75)
Currency exchange contracts | Intercompany loans and forecasted interest payments | Interest and other expense, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives instruments, pre-tax gains/(losses) recognized in earnings (5) 7 67 (73)
Currency exchange contracts | Forecasted transactions | Interest and other expense, net        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives instruments, pre-tax gains/(losses) recognized in earnings 0 6 (2) (3)
Currency exchange contracts | Forecasted transactions | Cost of sales        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives instruments, pre-tax gains/(losses) recognized in earnings 29 28 41 50
Currency exchange contracts | Forecasted transactions | Selling, general and administrative expenses        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives instruments, pre-tax gains/(losses) recognized in earnings (1) (1) 0 (2)
Commodity contracts | Cost of sales        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives instruments, pre-tax gains/(losses) recognized in earnings 151 136 362 (47)
Equity method investment contracts | Gain on equity method investment transactions        
Derivative Instruments, Gain (Loss) [Line Items]        
Derivatives instruments, pre-tax gains/(losses) recognized in earnings $ 2 $ 0 $ 2 $ 0