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ACCOUNTING POLICIES (Impairment) (Details) | Dec. 31, 2018 | Dec. 31, 2017
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Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Discount rate used in current estimate of value in use | 11.68% |
Cash-generating units |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Discount rate used in current estimate of value in use | 11.68% | 11.49%
Argentina | Subsidiaries |  |
Disclosure of impairment loss and reversal of impairment loss [line items] |  |
Discount rate used in current estimate of value in use | 13.50% |

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