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Provisions - Foreign Office Guarantees and Standby Letters of Credit - ECL Exposures (Details) - Foreign office guarantees and standby 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 $ 428 $ 256
Net change on exposures (348) 208
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 (1) (70)
Changes to models and assumptions (25)  
Foreign exchange adjustments 9 34
Exposure as at ending of period 63 428
Stage 1 - Individual [Member]    
Disclosure of other provisions [line items]    
Exposure as at beginning of period 428 256
Net change on exposures (366) 152
Transfer to Stage 1 8 60
Transfer to Stage 2 (6) (14)
Transfer to Stage 3
Impact on year-end ECL of exposures transferred between stages during the year (1) (56)
Changes to models and assumptions (32)  
Foreign exchange adjustments 10 30
Exposure as at ending of period 41 428
Stage 1 - Group [Member]    
Disclosure of other provisions [line items]    
Exposure as at beginning of period
Net change on exposures (1)
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 1
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 18
Transfer to Stage 1 (8)
Transfer to Stage 2 6 14
Transfer to Stage 3
Impact on year-end ECL of exposures transferred between stages during the year (14)
Changes to models and assumptions 7  
Foreign exchange adjustments (1)
Exposure as at ending of period 22
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
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 - Individual [Member]    
Disclosure of other provisions [line items]    
Exposure as at beginning of period
Net change on exposures 57
Transfer to Stage 1 (60)
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 3
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