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FINANCIAL INSTRUMENTS - Derivatives Measured at Fair Value (Details) - EUR (€)
€ in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure of financial instruments measured at fair value [line items]    
Other financial assets - derivatives € 39 € 70
Other financial liabilities - derivatives 55 31
Level 1    
Disclosure of financial instruments measured at fair value [line items]    
Other financial assets - derivatives 6 41
Other financial liabilities - derivatives 17 13
Level 2    
Disclosure of financial instruments measured at fair value [line items]    
Other financial assets - derivatives 33 29
Other financial liabilities - derivatives 38 18
Level 3    
Disclosure of financial instruments measured at fair value [line items]    
Other financial assets - derivatives 0 0
Other financial liabilities - derivatives € 0 € 0