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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Realized (losses) / gains on foreign currency derivatives - net € (2) € (2) € (1) € (5)
Unrealized (losses) / gains on foreign currency derivatives - net (6) 3 (7) 11
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 (losses) / gains on foreign currency derivatives - net (2) (2) 1 (4)
Unrealized (losses) / gains on foreign currency derivatives - net (5) 3 (7) 11
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 (losses) / gains on foreign currency derivatives - net 0 0 (2) (1)
Unrealized (losses) / gains on foreign currency derivatives - net (1) 0 0 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 (16) 2 (18) (9)
Gains reclassified from cash flow hedge reserve to the Consolidated Income Statement € 3 € 1 € 3 € 1