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BORROWINGS - Movement in Borrowings (Details) |  | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jul. 20, 2023 EUR (€) | Jun. 30, 2024 EUR (€) | Jun. 30, 2023 EUR (€) | Dec. 31, 2023 EUR (€) | Jun. 30, 2024 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
At January 1, |  | € 1,868,000,000 | € 2,056,000,000 | € 2,056,000,000 |
Cash flows |  |  |  |  |
Repayments of long-term borrowings |  | (4,000,000) | (5,000,000) | (53,000,000) |
Net change in revolving credit facilities and short-term borrowings |  | 0 | € 7,000,000 | (83,000,000) |
Lease repayments |  | (13,000,000) |  | (37,000,000) |
Non-cash changes |  |  |  |  |
Movement in accrued interest |  | 0 |  | (1,000,000) |
Changes in leases and other loans |  | 9,000,000 |  | 24,000,000 |
Deferred arrangement fees |  | 2,000,000 |  | 4,000,000 |
Effects of changes in foreign exchange rates |  | 33,000,000 |  | (42,000,000) |
At the end of the period |  | 1,895,000,000 |  | 1,868,000,000 |
Nominal value |  | 1,888,000,000 |  |  |
Amount drawn under credit facility |  | 1,895,000,000 |  | 1,868,000,000 |
Sustainability-Linked Senior Notes Issued February 2021 Due 2029 |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
At January 1, |  | 452,000,000 |  |  |
Non-cash changes |  |  |  |  |
At the end of the period |  | 466,000,000 |  | 452,000,000 |
Nominal value |  | 467,000,000 |  |  | $ 500,000,000
Amount drawn under credit facility |  | € 466,000,000 |  | 452,000,000 |
Nominal rate |  | 3.75% |  |  |
Sustainability-Link Senior Notes Issued June 2021 due 2029 |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
At January 1, |  | € 300,000,000 |  |  |
Non-cash changes |  |  |  |  |
At the end of the period |  | 301,000,000 |  | 300,000,000 |
Nominal value |  | 300,000,000 |  |  |
Amount drawn under credit facility |  | € 301,000,000 |  | 300,000,000 |
Nominal rate |  | 3.125% |  |  |
Senior Unsecured Notes due 2026 |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |
At January 1, |  | € 230,000,000 |  |  |
Non-cash changes |  |  |  |  |
At the end of the period | € 300,000,000 | 238,000,000 |  | 230,000,000 |
Proceeds from issuance of long-term borrowings | 50,000,000 |  |  |  |
Nominal value |  | 234,000,000 |  |  | $ 250,000,000
Amount drawn under credit facility | € 300,000,000 | € 238,000,000 |  | € 230,000,000 |
Nominal rate | 5.875% | 5.875% |  |  |

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