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ISSUED DEBT INSTRUMENTS AND OTHER FINANCIAL LIABILITIES (Details) - CLP ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of financial liabilities [line items]    
Subtotals $ 215,400 $ 242,030
Subtotals 8,115,233 7,093,653
Issued debt instruments and other financial liabilities 8,330,633 7,335,683
Mortgage Finance Bonds [Member]    
Disclosure of financial liabilities [line items]    
Subtotals 25,490 34,479
Senior Bonds [Member]    
Disclosure of financial liabilities [line items]    
Subtotals 7,198,865 6,186,760
Mortgage Bonds [Member]    
Disclosure of financial liabilities [line items]    
Subtotals 94,921 99,222
Subordinated Bonds [Member]    
Disclosure of financial liabilities [line items]    
Subtotals 795,957 773,192
Obligations To Public Sector [Member]    
Disclosure of financial liabilities [line items]    
Subtotals 32,449 59,470
Other Domestic Obligations [Member]    
Disclosure of financial liabilities [line items]    
Subtotals 175,210 175,389
Foreign Obligations [Member]    
Disclosure of financial liabilities [line items]    
Subtotals $ 7,741 $ 7,171