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FINANCIAL INSTRUMENTS - Derivatives Measured at Fair Value (Details) - EUR (€)
€ in Millions
Jun. 30, 2020
Dec. 31, 2019
Disclosure of financial instruments measured at fair value [line items]    
Other financial assets - derivatives € 31 € 29
Other financial liabilities - derivatives 75 58
Level 1    
Disclosure of financial instruments measured at fair value [line items]    
Other financial assets - derivatives 12 8
Other financial liabilities - derivatives 30 19
Level 2    
Disclosure of financial instruments measured at fair value [line items]    
Other financial assets - derivatives 19 21
Other financial liabilities - derivatives 45 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