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COMMITMENTS - Non-cancellable Lease Commitments Not Capitalized (Details) - EUR (€) € in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Disclosure of non-cancellable operating leases commitments [line items] |  |
Total non-cancellable minimum lease payments | € 10 | € 12
Less than 1 year |  |
Disclosure of non-cancellable operating leases commitments [line items] |  |
Total non-cancellable minimum lease payments | 4 | 3
1 to 5 years |  |
Disclosure of non-cancellable operating leases commitments [line items] |  |
Total non-cancellable minimum lease payments | 6 | 9
Over 5 years |  |
Disclosure of non-cancellable operating leases commitments [line items] |  |
Total non-cancellable minimum lease payments | € 0 | € 0

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