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Provisions - Maximum exposure to credit risk - Confirmed foreign letters of credit (Details) - Confirmed foreign letters of credit [Member] - CLP ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of other provisions [line items]      
Normal $ 94,673 $ 56,764  
Substandard  
Non-complying  
Total 94,673 56,764 $ 64,970
Stage 1 - Individual [Member]      
Disclosure of other provisions [line items]      
Normal 94,673 56,764  
Substandard  
Non-complying  
Total 94,673 56,764 64,970
Stage 1 - Group [Member]      
Disclosure of other provisions [line items]      
Normal  
Substandard  
Non-complying  
Total
Stage 2 - Individual [Member]      
Disclosure of other provisions [line items]      
Normal  
Substandard  
Non-complying  
Total
Stage 2 - Group [Member]      
Disclosure of other provisions [line items]      
Normal  
Substandard  
Non-complying  
Total
Stage 3 - Individual [Member]      
Disclosure of other provisions [line items]      
Normal  
Substandard  
Non-complying  
Total
Stage 3 - Group [Member]      
Disclosure of other provisions [line items]      
Normal  
Substandard  
Non-complying  
Total