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Derivative Instruments (Income Statement Location) (Details) - Foreign Exchange Contract - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net currency exchange rate gains (losses) | $ 3 | $ (1) | $ 1 | $ (13)
Cost of sales |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net currency exchange rate gains (losses) | 2 | 1 | 4 | (7)
Other income (expense), net |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Net currency exchange rate gains (losses) | $ 1 | $ (2) | $ (3) | $ (6)

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