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SHARE-BASED COMPENSATION - Narrative (Details) € / shares in Units, € in Millions | 1 Months Ended | 12 Months Ended
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Jul. 31, 2023 shares € / shares | Apr. 30, 2023 shares | Mar. 31, 2023 shares € / shares | Apr. 30, 2022 shares | May 31, 2020 shares | Apr. 30, 2020 | Apr. 30, 2019 | May 31, 2018 | Dec. 31, 2023 EUR (€) shares € / shares | Dec. 31, 2022 EUR (€) shares € / shares | Dec. 31, 2021 EUR (€) shares
Share Based Payment Plans [line items] |  |  |  |  |  |  |  |  |  |  |
Expense from share-based payment transactions with employees | € |  |  |  |  |  |  |  |  | € 20 | € 18 | € 15
PSUs |  |  |  |  |  |  |  |  |  |  |
Share Based Payment Plans [line items] |  |  |  |  |  |  |  |  |  |  |
Share based compensation, vesting period |  |  |  |  |  |  |  |  | 3 years |  |
Total shareholder return (TSR) percentage achieved |  |  |  |  |  | 174.00% | 200.00% | 182.90% |  |  |
Shares granted (in shares) |  | 1,701,233 |  | 1,849,268 | 1,161,718 |  |  |  |  |  |
Share price at grant date (in EUR per share) | € / shares |  |  |  |  |  |  |  |  | € 15.23 | € 17.11 |
PSUs | Bottom of range |  |  |  |  |  |  |  |  |  |  |
Share Based Payment Plans [line items] |  |  |  |  |  |  |  |  |  |  |
Percentage of vesting multiplier |  |  |  |  |  |  |  |  | 0.00% |  |
PSUs | Top of range |  |  |  |  |  |  |  |  |  |  |
Share Based Payment Plans [line items] |  |  |  |  |  |  |  |  |  |  |
Percentage of vesting multiplier |  |  |  |  |  |  |  |  | 200.00% |  |
RSUs |  |  |  |  |  |  |  |  |  |  |
Share Based Payment Plans [line items] |  |  |  |  |  |  |  |  |  |  |
Shares granted (in shares) |  |  |  |  |  |  |  |  | 701,976 | 556,360 |
RSUs | Certain Employees And Chief Financial Officer |  |  |  |  |  |  |  |  |  |  |
Share Based Payment Plans [line items] |  |  |  |  |  |  |  |  |  |  |
Shares granted (in shares) |  |  | 645,675 |  |  |  |  |  |  |  |
Vesting period on the grant date |  |  | 3 years |  |  |  |  |  |  |  |
Share price at grant date (in EUR per share) | € / shares |  |  | € 15.23 |  |  |  |  |  |  |  |
RSUs | Certain Employees |  |  |  |  |  |  |  |  |  |  |
Share Based Payment Plans [line items] |  |  |  |  |  |  |  |  |  |  |
Shares granted (in shares) | 56,301 |  |  |  |  |  |  |  |  |  |
Vesting period on the grant date |  |  | 3 years |  |  |  |  |  |  |  |
Share price at grant date (in EUR per share) | € / shares | € 15.60 |  |  |  |  |  |  |  |  |  |
RSUs | Board Members |  |  |  |  |  |  |  |  |  |  |
Share Based Payment Plans [line items] |  |  |  |  |  |  |  |  |  |  |
Shares granted (in shares) |  |  |  |  |  |  |  |  | 0 | 0 | 0

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