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Income taxes (Details) - CLP ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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IncomeTaxes [Line Items] |  |  |
Current tax assets, current |  | $ 29,201,159 | $ 29,423,479
Refundable tax previous year |  |  |
IncomeTaxes [Line Items] |  |  |
Current tax assets, current |  | 9,640,567 | 4,436,810
Taxes under claim [Member] |  |  |
IncomeTaxes [Line Items] |  |  |
Current tax assets, current | [1] | 2,141,476 | 2,141,476
Argentinean tax credits [Member] |  |  |
IncomeTaxes [Line Items] |  |  |
Current tax assets, current |  | 4,813,614 | 2,532,114
Monthly provisions [Member] |  |  |
IncomeTaxes [Line Items] |  |  |
Current tax assets, current |  | 11,155,690 | 18,860,164
Payment of absorbed profit provision [Member] |  |  |
IncomeTaxes [Line Items] |  |  |
Current tax assets, current |  | 24,104 | 75,141
Other credits [Member] |  |  |
IncomeTaxes [Line Items] |  |  |
Current tax assets, current |  | $ 1,425,708 | $ 1,377,774
[1] | This item includes claims for refund of first category taxes (Provisional payment of absorved profit) for an amount of ThCh$ 968,195 that was presented in April 2014 from the commercial year 2013 and claim to ThCh$ 1,173,281 presented in April 2010 from the commercial year 2009.

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