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FINANCIAL RISK MANAGEMENT - Foreign Currency Risk (Details) - Currency risk
$ in Thousands
 12 Months Ended
Dec. 31, 2017
CLP ($)
Disclosure of offsetting of financial liabilities [line items]  
Derivative financial liabilities $ 351,058,536
Financial liabilities net of assets and net of derivative contracts 4,095,112
Dollar  
Disclosure of offsetting of financial liabilities [line items]  
Gross financial assets subject to offsetting $ 7,168,862
Percentage of US denominated financial liabilities with derivative cross currency swaps 100.00%
Public and Bank liabilities  
Disclosure of offsetting of financial liabilities [line items]  
Gross financial liabilities subject to offsetting $ 358,227,398
Argentina | Public and Bank liabilities  
Disclosure of offsetting of financial liabilities [line items]  
Gross financial liabilities subject to offsetting 327,632
Chile | Public and Bank liabilities  
Disclosure of offsetting of financial liabilities [line items]  
Gross financial liabilities subject to offsetting $ 357,899,766