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BORROWINGS - Movement in Borrowings (Details) |  |  | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 02, 2021 EUR (€) | Feb. 24, 2021 EUR (€) | Jun. 30, 2021 EUR (€) | Jun. 30, 2020 EUR (€) | Dec. 31, 2020 EUR (€) | Jun. 30, 2021 USD ($) | Jun. 02, 2021 USD ($) | Feb. 24, 2021 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
At the beginning of the period (January 1) |  |  | € 2,391,000,000 | € 2,361,000,000 | € 2,361,000,000 |  |  |
Cash flows |  |  |  |  |  |  |  |
Proceeds from issuance of Senior Notes |  |  | 712,000,000 | 290,000,000 | 290,000,000 |  |  |
Repayments of Senior Notes |  |  | (863,000,000) | (200,000,000) | (200,000,000) |  |  |
Repayments of U.S. revolving credit facility |  |  | 0 |  | (129,000,000) |  |  |
Proceeds from other borrowings |  |  | 2,000,000 | 207,000,000 | 202,000,000 |  |  |
Repayments of other borrowings |  |  | (9,000,000) | € (4,000,000) | (10,000,000) |  |  |
Lease repayments |  |  | (17,000,000) |  | (35,000,000) |  |  |
Payment of deferred financing costs |  |  | (12,000,000) |  | (6,000,000) |  |  |
Non-cash changes |  |  |  |  |  |  |  |
Movement in interest accrued |  |  | (8,000,000) |  | (1,000,000) |  |  |
Changes in leases and other loans |  |  | 8,000,000 |  | 62,000,000 |  |  |
Deferred arrangement fees |  |  | 13,000,000 |  | 5,000,000 |  |  |
Effects of changes in foreign exchange rates |  |  | 40,000,000 |  | (148,000,000) |  |  |
At the end of the period |  |  | 2,257,000,000 |  | 2,391,000,000 |  |  |
Nominal value |  |  | 2,260,000,000 |  |  |  |  |
Sustainability-Linked Senior Notes Issued February 2021 Due 2029 |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
At the beginning of the period (January 1) |  |  | 0 |  |  |  |  |
Non-cash changes |  |  |  |  |  |  |  |
At the end of the period |  |  | 419,000,000 |  | 0 |  |  |
Nominal value |  |  | € 421,000,000 |  |  | $ 500,000,000 |  | $ 500,000,000
Nominal rate |  | 3.75% | 3.75% |  |  |  |  |
Senior Unsecured Notes due 2025 |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
At the beginning of the period (January 1) |  |  | € 534,000,000 |  |  |  |  |
Cash flows |  |  |  |  |  |  |  |
Repayments of Senior Notes |  | € (650,000,000) |  |  |  |  |  |
Non-cash changes |  |  |  |  |  |  |  |
At the end of the period |  |  | 0 |  | 534,000,000 |  |  |
Nominal value |  |  | € 0 |  |  | 650,000,000 |  |
Nominal rate |  | 6.625% | 6.625% |  |  |  |  |
Sustainability-Link Senior Notes Issued June 2021 due 2029 |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
At the beginning of the period (January 1) |  |  | € 0 |  |  |  |  |
Non-cash changes |  |  |  |  |  |  |  |
At the end of the period |  |  | 296,000,000 |  | 0 |  |  |
Nominal value |  |  | € 300,000,000 |  |  | 300,000,000 | $ 300,000,000 |
Nominal rate | 3.125% |  | 3.125% |  |  |  |  |
Senior Unsecured Notes due 2024 |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |
At the beginning of the period (January 1) |  |  | € 325,000,000 |  |  |  |  |
Cash flows |  |  |  |  |  |  |  |
Repayments of Senior Notes | € (400,000,000) |  |  |  |  |  |  |
Non-cash changes |  |  |  |  |  |  |  |
At the end of the period |  |  | 0 |  | € 325,000,000 |  |  |
Nominal value |  |  | € 0 |  |  | $ 400,000,000 |  |
Nominal rate | 5.75% |  | 5.75% |  |  |  |  |

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