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BORROWINGS - Movement in Borrowings (Details) € in Millions |  | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 08, 2019 EUR (€) | Jun. 30, 2020 EUR (€) | Jun. 30, 2019 EUR (€) | Dec. 31, 2019 EUR (€)
Disclosure of detailed information about borrowings [line items] |  |  |  |
Beginning Balance |  | € 2,361 |  |
Proceeds from issuance of Senior Notes |  | 290 | € 0 | € 0
(Repayments) of Senior Notes |  | (200) | 0 | (100)
Proceeds from non-current borrowings |  | 180 |  | 0
Proceeds from Swiss credit facility |  | 18 | 0 | 0
(Repayments) / proceeds from U.S. revolving credit facility and other loans |  | (124) |  | 109
Arrangement fees payment |  | (6) |  | 0
Lease repayments |  | (17) |  | (86)
Borrowings assumed through business combination |  | 0 |  | 75
Movement in interests accrued or capitalized |  | (1) |  | 1
New leases and other loans |  | 25 |  | 75
Deferred arrangement fees and other |  | 3 |  | 5
Effects of changes in foreign exchange rates |  | 7 |  | 29
Ending Balance |  | € 2,536 |  | 2,361
Exchange rate |  | 1.1198 |  |
Constellium SE (Issued May 2014, due 2021) |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Beginning Balance |  | € 200 |  |
(Repayments) of Senior Notes | € (100) |  |  |
Ending Balance | € 300 | € 0 |  | € 200
Nominal rate |  | 4.63% |  | 4.625%
Previously stated |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Beginning Balance |  |  | 2,151 | € 2,151
IFRS 16 application | IFRS 16 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Beginning Balance |  |  | 102 | 102
Restated | IFRS 16 |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Beginning Balance |  |  | € 2,253 | € 2,253

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