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Provisions - Performance Guarantees - Outstanding 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 $ 2,232,682 $ 2,220,828
Net change on exposures 84,753 (22,811)
Transfer to Stage 1
Transfer to Stage 2
Transfer to Stage 3
Foreign exchange adjustments (34,045) 34,665
Exposure as at ending of period 2,283,390 2,232,682
Stage 1 - Individual [Member]    
Disclosure of other provisions [line items]    
Exposure as at beginning of period 1,685,980 1,803,358
Net change on exposures 129,463 (6,282)
Transfer to Stage 1 249,755 189,344
Transfer to Stage 2 (229,813) (332,091)
Transfer to Stage 3 (74) (13)
Foreign exchange adjustments (30,937) 31,664
Exposure as at ending of period 1,804,374 1,685,980
Stage 1 - Group [Member]    
Disclosure of other provisions [line items]    
Exposure as at beginning of period 54,523 46,416
Net change on exposures (10,568) 8,008
Transfer to Stage 1 18,249 10,346
Transfer to Stage 2 (17,111) (9,034)
Transfer to Stage 3 (729) (1,304)
Foreign exchange adjustments (39) 91
Exposure as at ending of period 44,325 54,523
Stage 2 - Individual [Member]    
Disclosure of other provisions [line items]    
Exposure as at beginning of period 485,075 365,137
Net change on exposures (38,887) (23,779)
Transfer to Stage 1 (249,755) (189,279)
Transfer to Stage 2 230,906 332,365
Transfer to Stage 3 (3,884) (2,256)
Foreign exchange adjustments (3,028) 2,887
Exposure as at ending of period 420,427 485,075
Stage 2 - Group [Member]    
Disclosure of other provisions [line items]    
Exposure as at beginning of period 3,544 3,741
Net change on exposures 8,898 1,963
Transfer to Stage 1 (18,092) (10,258)
Transfer to Stage 2 17,417 9,067
Transfer to Stage 3 (792) (975)
Foreign exchange adjustments (5) 6
Exposure as at ending of period 10,970 3,544
Stage 3 - Individual [Member]    
Disclosure of other provisions [line items]    
Exposure as at beginning of period 2,310 1,162
Net change on exposures (2,950) (786)
Transfer to Stage 1 (65)
Transfer to Stage 2 (1,093) (274)
Transfer to Stage 3 3,958 2,269
Foreign exchange adjustments (31) 4
Exposure as at ending of period 2,194 2,310
Stage 3 - Group [Member]    
Disclosure of other provisions [line items]    
Exposure as at beginning of period 1,250 1,014
Net change on exposures (1,203) (1,935)
Transfer to Stage 1 (157) (88)
Transfer to Stage 2 (306) (33)
Transfer to Stage 3 1,521 2,279
Foreign exchange adjustments (5) 13
Exposure as at ending of period $ 1,100 $ 1,250