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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, 2021
EUR (€)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
EUR (€)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
EUR (€)
Dec. 31, 2019
USD ($)
Analysis of income and expense [line items]            
Total currency gains / (losses) - net € 13 $ 13 € (27) $ (27) € 3 $ 3
Realized (losses) / gains on foreign currency derivatives - net (1)   (11)   1  
Losses reclassified from OCI as a result of hedge accounting discontinuation 0   (6)   0  
Unrealized gains / (losses) on foreign currency derivatives - net 13   (8)   1  
Exchange gains / (losses) from the remeasurement of monetary assets and liabilities - net 1   (2)   1  
Included in Revenue            
Analysis of income and expense [line items]            
Total currency gains / (losses) - net (4)   (6)   (7)  
Included in Cost of sales            
Analysis of income and expense [line items]            
Total currency gains / (losses) - net 1   (2)   1  
Included in Other gains and losses - net            
Analysis of income and expense [line items]            
Total currency gains / (losses) - net € 16   € (19)   € 9