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FINANCIAL INSTRUMENTS - Derivatives Measured at Fair Value (Details) - EUR (€)
€ in Millions
Dec. 31, 2020
Dec. 31, 2019
Disclosure of financial instruments measured at fair value [line items]    
Other financial assets - derivatives € 57 € 29
Other financial liabilities - derivatives 87 58
Level 1    
Disclosure of financial instruments measured at fair value [line items]    
Other financial assets - derivatives 20 8
Other financial liabilities - derivatives 9 19
Level 2    
Disclosure of financial instruments measured at fair value [line items]    
Other financial assets - derivatives 37 21
Other financial liabilities - derivatives 78 39
Level 3    
Disclosure of financial instruments measured at fair value [line items]    
Other financial assets - derivatives 0 0
Other financial liabilities - derivatives € 0 € 0