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FINANCIAL INSTRUMENTS - Derivatives Measured at Fair Value (Details) - EUR (€)
€ in Millions
Jun. 30, 2021
Dec. 31, 2020
Disclosure of financial instruments measured at fair value [line items]    
Other financial assets - derivatives € 79 € 57
Other financial liabilities - derivatives 36 87
Level 1    
Disclosure of financial instruments measured at fair value [line items]    
Other financial assets - derivatives 44 20
Other financial liabilities - derivatives 8 9
Level 2    
Disclosure of financial instruments measured at fair value [line items]    
Other financial assets - derivatives 35 37
Other financial liabilities - derivatives 28 78
Level 3    
Disclosure of financial instruments measured at fair value [line items]    
Other financial assets - derivatives 0 0
Other financial liabilities - derivatives € 0 € 0