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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, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of nature and extent of risks arising from financial instruments [line items]      
Realized gains / (losses) on foreign currency derivatives - net € (8) € (1) € (11)
Unrealized (losses) / gains on foreign currency derivatives - net 6 13 (8)
Losses reclassified from OCI as a result of hedge accounting discontinuation 0 0 6
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 0 1 (4)
Unrealized (losses) / gains on foreign currency derivatives - net 6 15 (9)
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 (8) (2) (7)
Unrealized (losses) / gains on foreign currency derivatives - net 0 (2) 1
Losses reclassified from OCI as result of hedge accounting discontinuation 0 0 (6)
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 (16) (21) 20
Gains reclassified from cash flow hedge reserve to the Consolidated Income Statement € 8 € 4 € 6