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Summary of Significant Accounting Policies - Employee Benefits (Details) - CLP ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Defined benefit plan disclosures    
Threshold retiring period for specified employees to whom payments are made 30 years  
Staff Severance Indemnities Plan    
Defined benefit plan disclosures    
Discount rate for long term 4.25% 4.53%
Past service costs $ 0