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Provisions - Issued Foreign Letters of Credit - ECL Exposures (Details) - Issued 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 $ 93 $ 49
Net change on exposures (41) 44
Transfer to Stage 1
Transfer to Stage 2
Transfer to Stage 3
Impact on year-end ECL of exposures transferred between stages during the year (2) (4)
Changes to models and assumptions 1  
Foreign exchange adjustments 4
Exposure as at ending of period 51 93
Stage 1 - Individual [Member]    
Disclosure of other provisions [line items]    
Exposure as at beginning of period 83 43
Net change on exposures (61) 38
Transfer to Stage 1
Transfer to Stage 2 (3) (6)
Transfer to Stage 3
Impact on year-end ECL of exposures transferred between stages during the year 4
Changes to models and assumptions 1  
Foreign exchange adjustments 4
Exposure as at ending of period 20 83
Stage 1 - Group [Member]    
Disclosure of other provisions [line items]    
Exposure as at beginning of period 10 6
Net change on exposures (8) 7
Transfer to Stage 1
Transfer to Stage 2 (1) (3)
Transfer to Stage 3
Impact on year-end ECL of exposures transferred between stages during the year
Changes to models and assumptions  
Foreign exchange adjustments
Exposure as at ending of period 1 10
Stage 2 - Individual [Member]    
Disclosure of other provisions [line items]    
Exposure as at beginning of period
Net change on exposures 10
Transfer to Stage 1
Transfer to Stage 2 3 6
Transfer to Stage 3
Impact on year-end ECL of exposures transferred between stages during the year (2) (6)
Changes to models and assumptions  
Foreign exchange adjustments
Exposure as at ending of period 11
Stage 2 - Group [Member]    
Disclosure of other provisions [line items]    
Exposure as at beginning of period
Net change on exposures 18 (1)
Transfer to Stage 1
Transfer to Stage 2 1 3
Transfer to Stage 3
Impact on year-end ECL of exposures transferred between stages during the year (2)
Changes to models and assumptions  
Foreign exchange adjustments
Exposure as at ending of period 19
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
Impact on year-end ECL of exposures transferred between stages during the year
Changes to models and assumptions  
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
Impact on year-end ECL of exposures transferred between stages during the year
Changes to models and assumptions  
Foreign exchange adjustments
Exposure as at ending of period