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FINANCIAL RISK MANAGEMENT - Effect of Foreign Currency Derivatives Impacts and Commercial Transactions Exposures (Details) - EUR (€)
€ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Realized gains on foreign currency derivatives - net € 10 € (8) € (1)
Unrealized gains / (losses) on foreign currency derivatives - net (12) 6 13
Derivatives that do not qualify for hedge accounting | At fair value through profit and loss      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Realized gains on foreign currency derivatives - net 16 0 1
Unrealized gains / (losses) on foreign currency derivatives - net (12) 6 15
Derivatives that qualify for hedge accounting | At fair value through profit and loss      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Realized gains on foreign currency derivatives - net (6) (8) (2)
Unrealized gains / (losses) on foreign currency derivatives - net 0 0 (2)
Derivatives that qualify for hedge accounting | At fair value through OCI      
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Unrealized gains / (losses) on foreign currency derivatives - net 1 (16) (21)
Gains reclassified from cash flow hedge reserve to the Consolidated Income Statement € 6 € 8 € 4