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FAIR VALUE OF FINANCIAL ASSETS AND LIABILITIES (Details 4) - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of fair value measurement of assets [line items]    
As of January 1, 2018 $ 35,823,605  
Total realized and unrealized profits (losses)    
As of December 31, 2018 39,132,512 $ 35,823,605
Reconciliation of Changes in Fair Value Measurement, Liabilities [Roll Forward]    
As of January 1, 2018 32,675,685  
Total realized and unrealized profits (losses)    
As of December 31, 2018 35,887,052 32,675,685
Level 3 [Member]    
Disclosure of fair value measurement of assets [line items]    
As of January 1, 2018 22,987 40,034
Total realized and unrealized profits (losses)    
Included in statements of income (10,769) (17,035)
Included in other comprehensive income 25 (12)
Purchases, issuances, and loans (net)
As of December 31, 2018 12,193 22,987
Total profits or losses included in comprehensive income for 2017 that are attributable to change in unrealized profit (losses) related to assets or liabilities as of December 31, 2016 (10,794) (17,047)
Reconciliation of Changes in Fair Value Measurement, Liabilities [Roll Forward]    
As of January 1, 2018 7 43
Total realized and unrealized profits (losses)    
Included in statements of income (802) (36)
Included in other comprehensive income
Purchases, issuances, and loans (net)
As of December 31, 2018   7
Total profits or losses included in comprehensive income for 2017 that are attributable to change in unrealized profit (losses) related to assets or liabilities as of December 31, 2016 $ (802) $ (36)