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Provisions - Confirmed Foreign Letters of Credit - Outstanding Exposures (Details) - Confirmed foreign letters of credit [Member] - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of other provisions [line items]    
Exposure as at beginning of period $ 56,764 $ 64,970
Net change on exposures 46,648 (15,447)
Transfer to Stage 1
Transfer to Stage 2
Transfer to Stage 3
Foreign exchange adjustments (8,739) 7,241
Exposure as at ending of period 94,673 56,764
Stage 1 - Individual [Member]    
Disclosure of other provisions [line items]    
Exposure as at beginning of period 56,764 64,970
Net change on exposures 46,648 (15,455)
Transfer to Stage 1
Transfer to Stage 2
Transfer to Stage 3
Foreign exchange adjustments (8,739) 7,249
Exposure as at ending of period 94,673 56,764
Stage 1 - Group [Member]    
Disclosure of other provisions [line items]    
Exposure as at beginning of period
Net change on exposures
Transfer to Stage 1
Transfer to Stage 2
Transfer to Stage 3
Foreign exchange adjustments
Exposure as at ending of period
Stage 2 - Individual [Member]    
Disclosure of other provisions [line items]    
Exposure as at beginning of period
Net change on exposures 8
Transfer to Stage 1
Transfer to Stage 2
Transfer to Stage 3
Foreign exchange adjustments (8)
Exposure as at ending of period
Stage 2 - Group [Member]    
Disclosure of other provisions [line items]    
Exposure as at beginning of period
Net change on exposures
Transfer to Stage 1
Transfer to Stage 2
Transfer to Stage 3
Foreign exchange adjustments
Exposure as at ending of period
Stage 3 - Individual [Member]    
Disclosure of other provisions [line items]    
Exposure as at beginning of period
Net change on exposures
Transfer to Stage 1
Transfer to Stage 2
Transfer to Stage 3
Foreign exchange adjustments
Exposure as at ending of period
Stage 3 - Group [Member]    
Disclosure of other provisions [line items]    
Exposure as at beginning of period
Net change on exposures
Transfer to Stage 1
Transfer to Stage 2
Transfer to Stage 3
Foreign exchange adjustments
Exposure as at ending of period