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Derivative Instruments (Movements out of OCI) (Details) - Foreign currency exchange forward contracts - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Derivative [Line Items]      
Foreign currency transaction gains (losses) $ 1 $ (15) $ (19)
Cost of sales      
Derivative [Line Items]      
Foreign currency transaction gains (losses) 7 (6) 0
Other income (expense), net      
Derivative [Line Items]      
Foreign currency transaction gains (losses) $ (6) $ (9) $ (19)