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FINANCIAL RISK MANAGEMENT - Effect of Foreign Currency Derivatives Impacts and Commercial Transactions Exposures (Details) - EUR (€) € in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Realized gains on foreign currency derivatives - net | € 10 | € (8) | € (1)
Unrealized gains / (losses) on foreign currency derivatives - net | (12) | 6 | 13
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 on foreign currency derivatives - net | 16 | 0 | 1
Unrealized gains / (losses) on foreign currency derivatives - net | (12) | 6 | 15
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 on foreign currency derivatives - net | (6) | (8) | (2)
Unrealized gains / (losses) on foreign currency derivatives - net | 0 | 0 | (2)
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 | 1 | (16) | (21)
Gains reclassified from cash flow hedge reserve to the Consolidated Income Statement | € 6 | € 8 | € 4

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