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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, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |  |
Realized (losses) / gains on foreign currency derivatives - net | € (4) | € 4 | € (8) | € 6
Unrealized (losses) / gains on foreign currency derivatives - net | (3) | (6) | (12) | (3)
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) | 5 | (4) | 9
Unrealized (losses) / gains on foreign currency derivatives - net | (3) | (6) | (11) | (4)
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 | (2) | (1) | (4) | (3)
Unrealized (losses) / gains on foreign currency derivatives - net | 0 | 0 | (1) | 1
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 | (5) | 0 | (9) | 2
Gains reclassified from cash flow hedge reserve to the Consolidated Income Statement | € 3 | € 1 | € 5 | € 2

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