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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Realized gains / (losses) on foreign currency derivatives - net € (1) € (11) € 1
Unrealized (losses) / gains on foreign currency derivatives - net 13 (8) 1
Losses reclassified from OCI as a result of hedge accounting discontinuation 0 6 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 gains / (losses) on foreign currency derivatives - net 1 (4) 7
Unrealized (losses) / gains on foreign currency derivatives - net 15 (9) 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 gains / (losses) on foreign currency derivatives - net (2) (7) (6)
Unrealized (losses) / gains on foreign currency derivatives - net (2) 1 (1)
Losses reclassified from OCI as result of hedge accounting discontinuation 0 (6) 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 (losses) / gains on foreign currency derivatives - net (21) 20 (15)
Gains reclassified from cash flow hedge reserve to the Consolidated Income Statement € 4 € 6 € 7