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CURRENCY GAINS / (LOSSES) - Currency Gains and Losses Included in Income from Operations (Details)
€ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
EUR (€)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
EUR (€)
Dec. 31, 2018
USD ($)
Analysis of income and expense [line items]            
Total currency gains / (losses) - net € (27) $ (27) € 3 $ 3 € 11 $ 11
Realized exchange (losses) / gains on foreign currency derivatives - net (11)   1   11  
Losses reclassified from OCI as a result of hedge accounting discontinuation (6)   0   0  
Unrealized (losses) / gains on foreign currency derivatives - net (8)   1   (3)  
Exchange (losses) / gains from the remeasurement of monetary assets and liabilities - net (2)   1   3  
Included in Revenue            
Analysis of income and expense [line items]            
Total currency gains / (losses) - net (6)   (7)   2  
Included in Cost of sales            
Analysis of income and expense [line items]            
Total currency gains / (losses) - net (2)   1   2  
Included in Other gains and losses - net            
Analysis of income and expense [line items]            
Total currency gains / (losses) - net € (19)   € 9   € 7