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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Realized (losses) / gains on foreign currency derivatives - net € (11) € 1 € 11
Unrealized gains / (losses) on foreign currency derivatives - net (8) 1 (3)
Losses reclassified from OCI as a result of hedge accounting discontinuation 6 0 0
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 (4) 7 7
Unrealized gains / (losses) on foreign currency derivatives - net (9) 2 (1)
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 (7) (6) 4
Unrealized gains / (losses) on foreign currency derivatives - net 1 (1) (2)
Losses reclassified from OCI as result of hedge accounting discontinuation (6) 0 0
Losses reclassified from OCI as a result of hedge accounting discontinuation 6    
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 20 (15) (23)
Gains / (losses) reclassified from cash flow hedge reserve to Consolidated Income Statement € 6 € 7 € (2)