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FINANCIAL RISK MANAGEMENT - Effect of Foreign Currency Derivatives Impacts and Commercial Transactions Exposures (Details) - EUR (€)
€ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Realized gains / (losses) on foreign currency derivatives - net € 4 € (2) € 6 € (1)
Unrealized (losses) / gains on foreign currency derivatives - net (6) (6) (3) (7)
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 / (losses) on foreign currency derivatives - net 5 (2) 9 1
Unrealized (losses) / gains on foreign currency derivatives - net (6) (5) (4) (7)
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 / (losses) on foreign currency derivatives - net (1) 0 (3) (2)
Unrealized (losses) / gains on foreign currency derivatives - net 0 (1) 1 0
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 (losses) / gains on foreign currency derivatives - net 0 (16) 2 (18)
Gains reclassified from cash flow hedge reserve to the Consolidated Income Statement € 1 € 3 € 2 € 3