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Accounting Changes (Details 2) - CLP ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of effect of overlay approach reclassification on profit or loss [line items]      
Total loans and account receivable $ 31,775,420 $ 29,331,001  
Total financial assets measured at FVOCI 66,166 68,694 $ 107,998
Total 2,042 723  
Total contingents 9,218,413 9,324,947  
IFRS 9 [Member]      
Disclosure of effect of overlay approach reclassification on profit or loss [line items]      
Total loans and account receivable   888,091  
Total financial assets measured at FVOCI   97  
Total contingents   23,761  
Total provision for loan losses   $ 911,949  
IFRS 9 [Member] | Other Credit Related commitments [Member] | Loan Commitments [Member]      
Disclosure of effect of overlay approach reclassification on profit or loss [line items]      
Total contingents 19,124    
IFRS 9 [Member] | Other Credit Related commitments [Member] | Contingent liabilities [Member]      
Disclosure of effect of overlay approach reclassification on profit or loss [line items]      
Total contingents 4,637    
IFRS 9 [Member] | Available For Sale Investments [Member] | Loans And Accounts Receivable From Customers [Member]      
Disclosure of effect of overlay approach reclassification on profit or loss [line items]      
Total loans and account receivable 97    
IFRS 9 [Member] | Amortised Cost [Member] | Loans And Accounts Receivable From Customers [Member]      
Disclosure of effect of overlay approach reclassification on profit or loss [line items]      
Total loans and account receivable 888,091    
IFRS 9 [Member] | Amortised Cost [Member] | Interbank Loans Net [Member]      
Disclosure of effect of overlay approach reclassification on profit or loss [line items]      
Total loans and account receivable    
IAS 39 [Member]      
Disclosure of effect of overlay approach reclassification on profit or loss [line items]      
Total loans and account receivable 791,157    
Total financial assets measured at FVOCI    
Total contingents 8,404    
Total provision for loan losses 799,561    
IAS 39 [Member] | Other Credit Related commitments [Member] | Loan Commitments [Member]      
Disclosure of effect of overlay approach reclassification on profit or loss [line items]      
Total contingents    
IAS 39 [Member] | Other Credit Related commitments [Member] | Contingent liabilities [Member]      
Disclosure of effect of overlay approach reclassification on profit or loss [line items]      
Total contingents 8,404    
IAS 39 [Member] | Available For Sale Investments [Member] | Investment Securities [Member]      
Disclosure of effect of overlay approach reclassification on profit or loss [line items]      
Total loans and account receivable    
IAS 39 [Member] | Amortised Cost [Member] | Loans And Accounts Receivable From Customers [Member]      
Disclosure of effect of overlay approach reclassification on profit or loss [line items]      
Total loans and account receivable 790,685    
IAS 39 [Member] | Amortised Cost [Member] | Interbank Loans Net [Member]      
Disclosure of effect of overlay approach reclassification on profit or loss [line items]      
Total loans and account receivable 472    
Reclassification [Member]      
Disclosure of effect of overlay approach reclassification on profit or loss [line items]      
Total loans and account receivable (388)    
Total financial assets measured at FVOCI 388    
Total contingents    
Total provision for loan losses    
Reclassification [Member] | Other Credit Related commitments [Member] | Loan Commitments [Member]      
Disclosure of effect of overlay approach reclassification on profit or loss [line items]      
Total contingents    
Reclassification [Member] | Other Credit Related commitments [Member] | Contingent liabilities [Member]      
Disclosure of effect of overlay approach reclassification on profit or loss [line items]      
Total contingents    
Reclassification [Member] | Available For Sale Investments [Member] | Loans And Accounts Receivable From Customers [Member]      
Disclosure of effect of overlay approach reclassification on profit or loss [line items]      
Total loans and account receivable 388    
Reclassification [Member] | Amortised Cost [Member] | Loans And Accounts Receivable From Customers [Member]      
Disclosure of effect of overlay approach reclassification on profit or loss [line items]      
Total loans and account receivable 84    
Reclassification [Member] | Amortised Cost [Member] | Interbank Loans Net [Member]      
Disclosure of effect of overlay approach reclassification on profit or loss [line items]      
Total loans and account receivable (472)    
Remeasurement [Member]      
Disclosure of effect of overlay approach reclassification on profit or loss [line items]      
Total loans and account receivable 97,322    
Total financial assets measured at FVOCI (291)    
Total contingents 15,357    
Total provision for loan losses 112,388    
Remeasurement [Member] | Other Credit Related commitments [Member] | Loan Commitments [Member]      
Disclosure of effect of overlay approach reclassification on profit or loss [line items]      
Total contingents 19,124    
Remeasurement [Member] | Other Credit Related commitments [Member] | Contingent liabilities [Member]      
Disclosure of effect of overlay approach reclassification on profit or loss [line items]      
Total contingents (3,767)    
Remeasurement [Member] | Available For Sale Investments [Member] | Loans And Accounts Receivable From Customers [Member]      
Disclosure of effect of overlay approach reclassification on profit or loss [line items]      
Total loans and account receivable (291)    
Remeasurement [Member] | Amortised Cost [Member] | Loans And Accounts Receivable From Customers [Member]      
Disclosure of effect of overlay approach reclassification on profit or loss [line items]      
Total loans and account receivable 97,322    
Remeasurement [Member] | Amortised Cost [Member] | Interbank Loans Net [Member]      
Disclosure of effect of overlay approach reclassification on profit or loss [line items]      
Total loans and account receivable