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FINANCIAL RISK MANAGEMENT - Effect of Foreign Currency Derivatives Impacts and Financing Transaction Exposures (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Realized gains / (losses) on foreign currency derivatives - net € (8) € (1) € (11)
Unrealized (losses) / gains on foreign currency derivatives - net 6 13 (8)
Total 1 10 (32)
Currency risk | At fair value through profit and loss      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Realized gains / (losses) on foreign currency derivatives - net 2 (36) 7
Unrealized (losses) / gains on foreign currency derivatives - net (1) 46 (39)
Total € 1 € 10 € (32)