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Issued Debt Instruments and Other Financial Liabilities (Details 6) - CLP ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of financial liabilities [line items]      
Issued debt instruments $ 9,500,723 $ 8,115,233 $ 7,093,653
Senior Bonds [Member]      
Disclosure of financial liabilities [line items]      
Issued debt instruments 8,574,213 7,198,865  
Senior Bonds [Member] | Due After 4 Years But Within 5 Years [Member]      
Disclosure of financial liabilities [line items]      
Issued debt instruments 1,278,746 421,918  
Senior Bonds [Member] | Due After 3 Years But Within 4 Years [Member]      
Disclosure of financial liabilities [line items]      
Issued debt instruments 742,238 1,104,547  
Senior Bonds [Member] | Due After 2 Years But Within 3 years [Member]      
Disclosure of financial liabilities [line items]      
Issued debt instruments 1,221,393 1,073,847  
Senior Bonds [Member] | Due After 1 Year But Within 2 Years [Member]      
Disclosure of financial liabilities [line items]      
Issued debt instruments 1,147,825 1,331,255  
Senior Bonds [Member] | Due Within 1 Year [Member]      
Disclosure of financial liabilities [line items]      
Issued debt instruments 2,078,202 844,898  
Senior Bonds [Member] | Due After 5 Years [Member]      
Disclosure of financial liabilities [line items]      
Issued debt instruments 2,105,809 2,422,400  
Subordinated Bonds [Member]      
Disclosure of financial liabilities [line items]      
Issued debt instruments 818,084 795,957  
Subordinated Bonds [Member] | Due After 4 Years But Within 5 Years [Member]      
Disclosure of financial liabilities [line items]      
Issued debt instruments  
Subordinated Bonds [Member] | Due After 3 Years But Within 4 Years [Member]      
Disclosure of financial liabilities [line items]      
Issued debt instruments  
Subordinated Bonds [Member] | Due After 2 Years But Within 3 years [Member]      
Disclosure of financial liabilities [line items]      
Issued debt instruments  
Subordinated Bonds [Member] | Due After 1 Year But Within 2 Years [Member]      
Disclosure of financial liabilities [line items]      
Issued debt instruments  
Subordinated Bonds [Member] | Due Within 1 Year [Member]      
Disclosure of financial liabilities [line items]      
Issued debt instruments 1  
Subordinated Bonds [Member] | Due After 5 Years [Member]      
Disclosure of financial liabilities [line items]      
Issued debt instruments 818,084 795,956  
Mortgage Bonds [Member]      
Disclosure of financial liabilities [line items]      
Issued debt instruments 89,924 94,921  
Mortgage Bonds [Member] | Due After 4 Years But Within 5 Years [Member]      
Disclosure of financial liabilities [line items]      
Issued debt instruments 9,072 8,534  
Mortgage Bonds [Member] | Due After 3 Years But Within 4 Years [Member]      
Disclosure of financial liabilities [line items]      
Issued debt instruments 8,788 8,267  
Mortgage Bonds [Member] | Due After 2 Years But Within 3 years [Member]      
Disclosure of financial liabilities [line items]      
Issued debt instruments 8,514 8,008  
Mortgage Bonds [Member] | Due After 1 Year But Within 2 Years [Member]      
Disclosure of financial liabilities [line items]      
Issued debt instruments 8,248 7,758  
Mortgage Bonds [Member] | Due Within 1 Year [Member]      
Disclosure of financial liabilities [line items]      
Issued debt instruments 5,137 4,833  
Mortgage Bonds [Member] | Due After 5 Years [Member]      
Disclosure of financial liabilities [line items]      
Issued debt instruments 50,165 57,521  
Mortgage Finance Bonds [Member]      
Disclosure of financial liabilities [line items]      
Issued debt instruments 18,502 25,490  
Mortgage Finance Bonds [Member] | Due After 4 Years But Within 5 Years [Member]      
Disclosure of financial liabilities [line items]      
Issued debt instruments 1,005 2,480  
Mortgage Finance Bonds [Member] | Due After 3 Years But Within 4 Years [Member]      
Disclosure of financial liabilities [line items]      
Issued debt instruments 2,442 3,997  
Mortgage Finance Bonds [Member] | Due After 2 Years But Within 3 years [Member]      
Disclosure of financial liabilities [line items]      
Issued debt instruments 3,928 5,034  
Mortgage Finance Bonds [Member] | Due After 1 Year But Within 2 Years [Member]      
Disclosure of financial liabilities [line items]      
Issued debt instruments 4,944 5,946  
Mortgage Finance Bonds [Member] | Due Within 1 Year [Member]      
Disclosure of financial liabilities [line items]      
Issued debt instruments 6,013 6,830  
Mortgage Finance Bonds [Member] | Due After 5 Years [Member]      
Disclosure of financial liabilities [line items]      
Issued debt instruments $ 170 $ 1,203