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Provisions - Other Commitments - Outstanding Exposures (Details) - Other commitments [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 $ 46,561 $ 60,609
Net change on exposures 108,602 (14,048)
Transfer to Stage 1
Transfer to Stage 2
Transfer to Stage 3
Foreign exchange adjustments
Exposure as at ending of period 155,163 46,561
Stage 1 - Individual [Member]    
Disclosure of other provisions [line items]    
Exposure as at beginning of period 46,561 49,519
Net change on exposures 108,602 (2,958)
Transfer to Stage 1
Transfer to Stage 2
Transfer to Stage 3
Foreign exchange adjustments
Exposure as at ending of period 155,163 46,561
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 11,090
Net change on exposures (11,090)
Transfer to Stage 1
Transfer to Stage 2
Transfer to Stage 3
Foreign exchange adjustments
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