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Derivative Instruments - Balance Sheet Classification (Details)
€ in Millions, $ in Millions
Mar. 31, 2019
USD ($)
Mar. 31, 2019
EUR (€)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
EUR (€)
Mar. 31, 2018
USD ($)
Mar. 31, 2018
EUR (€)
Derivatives, Fair Value            
Total asset derivatives $ 47   $ 25   $ 18  
Total liability derivatives 10   12   42  
Current derivative asset 23   19   14  
Current derivative liability 3   3      
Noncurrent derivative asset 24   6   4  
Noncurrent derivative liability 7   9   42  
Derivatives designated as hedging instruments            
Derivatives, Fair Value            
Total asset derivatives 45   23   18  
Total liability derivatives 9   10   42  
Derivatives designated as hedging instruments | Commodity forwards contracts            
Derivatives, Fair Value            
Notional amount 20   21   31  
Total asset derivatives 3   1   4  
Derivatives designated as hedging instruments | Interest rate swaps - fair value hedges            
Derivatives, Fair Value            
Notional amount | €   € 725   € 725   € 725
Total asset derivatives 18   6   4  
Total liability derivatives     1   15  
Derivatives designated as hedging instruments | Interest rate swaps - cash flow hedges            
Derivatives, Fair Value            
Notional amount 180   180      
Total liability derivatives 1          
Derivatives designated as hedging instruments | Cash flow hedges of foreign exchange risk            
Derivatives, Fair Value            
Notional amount 797   587   310  
Total asset derivatives 18   10   6  
Total liability derivatives 4   1   26  
Derivatives designated as hedging instruments | Net investment hedges            
Derivatives, Fair Value            
Notional amount | €   € 160   € 160    
Total asset derivatives 6   6   4  
Total liability derivatives 4   8   1  
Derivatives not designated as hedging instruments | Foreign exchange contracts            
Derivatives, Fair Value            
Notional amount 625   470   $ 350  
Total asset derivatives 2   2      
Total liability derivatives $ 1   $ 2