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Financial Instruments - Cash flow hedges (Details) - Cash flow hedging - Currency exchange contracts - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]        
Gain (loss) recognized in AOCI $ (7) $ 4 $ 1 $ 2
Gain (loss) reclassified from AOCI to earnings $ 0 $ (2) $ 0 $ (8)