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Provisions - Performance Guarantees - ECL Exposures (Details) - Performance guarantees [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 $ 4,080 $ 3,676
Net change on exposures (659) 301
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 473 48
Changes to models and assumptions 137  
Foreign exchange adjustments 6 55
Exposure as at ending of period 4,037 4,080
Stage 1 - Individual [Member]    
Disclosure of other provisions [line items]    
Exposure as at beginning of period 2,308 1,841
Net change on exposures (1,717) 664
Transfer to Stage 1 287
Transfer to Stage 2 (249) (439)
Transfer to Stage 3 (2)
Impact on year-end ECL of exposures transferred between stages during the year (18) 209
Changes to models and assumptions (15)  
Foreign exchange adjustments 7 33
Exposure as at ending of period 601 2,308
Stage 1 - Group [Member]    
Disclosure of other provisions [line items]    
Exposure as at beginning of period 509 384
Net change on exposures (178) 73
Transfer to Stage 1 20 18
Transfer to Stage 2 (233) (87)
Transfer to Stage 3 (22) (80)
Impact on year-end ECL of exposures transferred between stages during the year 182 200
Changes to models and assumptions  
Foreign exchange adjustments (1) 1
Exposure as at ending of period 277 509
Stage 2 - Individual [Member]    
Disclosure of other provisions [line items]    
Exposure as at beginning of period 765 947
Net change on exposures 767 (113)
Transfer to Stage 1 (287)
Transfer to Stage 2 919 442
Transfer to Stage 3 (192) (86)
Impact on year-end ECL of exposures transferred between stages during the year (684) (444)
Changes to models and assumptions 152  
Foreign exchange adjustments 19
Exposure as at ending of period 1,440 765
Stage 2 - Group [Member]    
Disclosure of other provisions [line items]    
Exposure as at beginning of period
Net change on exposures 789 (2)
Transfer to Stage 1 (20)
Transfer to Stage 2 233 90
Transfer to Stage 3 (17)
Impact on year-end ECL of exposures transferred between stages during the year (231) (88)
Changes to models and assumptions  
Foreign exchange adjustments
Exposure as at ending of period 754
Stage 3 - Individual [Member]    
Disclosure of other provisions [line items]    
Exposure as at beginning of period 495 470
Net change on exposures (791) (310)
Transfer to Stage 1
Transfer to Stage 2 (670) (3)
Transfer to Stage 3 194 86
Impact on year-end ECL of exposures transferred between stages during the year 1,263 250
Changes to models and assumptions  
Foreign exchange adjustments 2
Exposure as at ending of period 491 495
Stage 3 - Group [Member]    
Disclosure of other provisions [line items]    
Exposure as at beginning of period 3 34
Net change on exposures 471 (11)
Transfer to Stage 1 (18)
Transfer to Stage 2 (3)
Transfer to Stage 3 39 80
Impact on year-end ECL of exposures transferred between stages during the year (39) (79)
Changes to models and assumptions  
Foreign exchange adjustments
Exposure as at ending of period $ 474 $ 3