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FINANCIAL INSTRUMENTS - Derivatives Measured at Fair Value (Details) - EUR (€)
€ in Millions
Jun. 30, 2023
Dec. 31, 2022
Disclosure of financial instruments measured at fair value [line items]    
Other financial assets - derivatives € 26 € 39
Other financial liabilities - derivatives 65 55
Level 1    
Disclosure of financial instruments measured at fair value [line items]    
Other financial assets - derivatives 5 6
Other financial liabilities - derivatives 31 17
Level 2    
Disclosure of financial instruments measured at fair value [line items]    
Other financial assets - derivatives 21 33
Other financial liabilities - derivatives 34 38
Level 3    
Disclosure of financial instruments measured at fair value [line items]    
Other financial assets - derivatives 0 0
Other financial liabilities - derivatives € 0 € 0