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Derivative Instruments (Income Statement Location) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Foreign Exchange Contract |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net currency exchange rate gains (losses) | $ 6 | $ 8 | $ 11 | $ 5
Foreign Exchange Contract | Cost of sales |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net currency exchange rate gains (losses) | (4) | 3 | (5) | 0
Foreign Exchange Contract | Other income (expense), net |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net currency exchange rate gains (losses) | 1 | (2) | (1) | (9)
Net Investment | Other income (expense), net |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net currency exchange rate gains (losses) | $ 9 | $ 7 | $ 17 | $ 14

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