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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Disclosure of nature and extent of risks arising from financial instruments [line items]        
Realized (losses) / gains on foreign currency derivatives - net € (2) € (3) € (5) € (3)
Unrealized gains on foreign currency derivatives - net 3 0 11 (2)
Losses reclassified from OCI as a result of hedge accounting discontinuation 0 5 0 5
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) 0 (4) 2
Unrealized gains on foreign currency derivatives - net 3 (1) 11 (2)
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 (3) (1) (5)
Unrealized gains on foreign currency derivatives - net 0 1 0 0
Losses reclassified from OCI as result of hedge accounting discontinuation 0 (5) 0 (5)
Losses reclassified from OCI as a result of hedge accounting discontinuation     5  
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 on foreign currency derivatives - net 2 2 (9) (6)
Gains / (losses) reclassified from cash flow hedge reserve to the Interim Income Statement € 1 € 3 € 1 € 6