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Income taxes (Details 2) - CLP ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Taxes [Abstract]      
Income as per deferred tax related to the origin and reversal of temporary differences $ (500,800) $ (878,629) $ (454,933)
Prior year adjustments 569,212 3,838,136 3,204,656
Effect of change in tax rates (50,071) (856,612) (1,066,964)
Tax benefits (loss) 611,282 (765,292) 248,559
Total deferred tax expense 629,623 1,337,603 1,931,318
Current tax expense (47,841,130) (31,285,976) (48,168,474)
Prior period adjustments (1,154,469) (298,010) (3,877,360)
(Loss) Income from income tax $ (48,365,976) $ (30,246,383) $ (50,114,516)