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Financial Instruments - Narrative (Details) - 3 months ended Mar. 31, 2019
€ in Millions, $ in Millions
USD ($)
EUR (€)
USD ($)
Derivative [Line Items]      
Net losses expected to be reclassified to earnings     $ (1)
Net Investment Hedging      
Derivative [Line Items]      
Euro-denominated notes   € 1,050 1,170
Euro-denominated notes designated as a hedge   € 180 $ 200
Exchange rate movements reducing long-term debt $ 206    
Decrease in long-term debt $ 4