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Provisions - Analysis of changes in exposures - Performance guarantees (Details) - Performance guarantees
$ in Millions
 12 Months Ended
Dec. 31, 2018
CLP ($)
Contingencies and Commitments  
Exposure as at beginning of period $ 2,220,828
Total 2,232,682
12-month expected credit losses | Financial instruments not credit-impaired | Individual  
Contingencies and Commitments  
Total 1,685,980
12-month expected credit losses | Financial instruments not credit-impaired | Group  
Contingencies and Commitments  
Total 54,523
Lifetime expected credit losses | Financial instruments not credit-impaired | Individual  
Contingencies and Commitments  
Total 485,075
Lifetime expected credit losses | Financial instruments not credit-impaired | Group  
Contingencies and Commitments  
Total 3,544
Lifetime expected credit losses | Financial instruments credit-impaired | Individual  
Contingencies and Commitments  
Total 2,310
Lifetime expected credit losses | Financial instruments credit-impaired | Group  
Contingencies and Commitments  
Total 1,250
Gross Balance  
Contingencies and Commitments  
Exposure as at beginning of period 2,220,828
Net change on exposures (22,811)
Foreign exchange adjustments 34,665
Total 2,232,682
Gross Balance | 12-month expected credit losses | Financial instruments not credit-impaired | Individual  
Contingencies and Commitments  
Exposure as at beginning of period 1,803,358
Net change on exposures (6,282)
Transfer to Stage 1 189,344
Transfer to Stage 2 (332,091)
Transfer to Stage 3 (13)
Foreign exchange adjustments 31,664
Total 1,685,980
Gross Balance | 12-month expected credit losses | Financial instruments not credit-impaired | Group  
Contingencies and Commitments  
Exposure as at beginning of period 46,416
Net change on exposures 8,008
Transfer to Stage 1 10,346
Transfer to Stage 2 (9,034)
Transfer to Stage 3 (1,304)
Foreign exchange adjustments 91
Total 54,523
Gross Balance | Lifetime expected credit losses | Financial instruments not credit-impaired | Individual  
Contingencies and Commitments  
Exposure as at beginning of period 365,137
Net change on exposures (23,779)
Transfer to Stage 1 (189,279)
Transfer to Stage 2 332,365
Transfer to Stage 3 (2,256)
Foreign exchange adjustments 2,887
Total 485,075
Gross Balance | Lifetime expected credit losses | Financial instruments not credit-impaired | Group  
Contingencies and Commitments  
Exposure as at beginning of period 3,741
Net change on exposures 1,963
Transfer to Stage 1 (10,258)
Transfer to Stage 2 9,067
Transfer to Stage 3 (975)
Foreign exchange adjustments 6
Total 3,544
Gross Balance | Lifetime expected credit losses | Financial instruments credit-impaired | Individual  
Contingencies and Commitments  
Exposure as at beginning of period 1,162
Net change on exposures (786)
Transfer to Stage 1 (65)
Transfer to Stage 2 (274)
Transfer to Stage 3 2,269
Foreign exchange adjustments 4
Total 2,310
Gross Balance | Lifetime expected credit losses | Financial instruments credit-impaired | Group  
Contingencies and Commitments  
Exposure as at beginning of period 1,014
Net change on exposures (1,935)
Transfer to Stage 1 (88)
Transfer to Stage 2 (33)
Transfer to Stage 3 2,279
Foreign exchange adjustments 13
Total 1,250
Accumulated Amortization  
Contingencies and Commitments  
Exposure as at beginning of period 3,676
Net change on exposures 301
Impact on year end ECL of exposures transferred between stages during the year 48
Foreign exchange adjustments 55
Total 4,080
Accumulated Amortization | 12-month expected credit losses | Financial instruments not credit-impaired | Individual  
Contingencies and Commitments  
Exposure as at beginning of period 1,841
Net change on exposures 664
Transfer to Stage 2 (439)
Impact on year end ECL of exposures transferred between stages during the year 209
Foreign exchange adjustments 33
Total 2,308
Accumulated Amortization | 12-month expected credit losses | Financial instruments not credit-impaired | Group  
Contingencies and Commitments  
Exposure as at beginning of period 384
Net change on exposures 73
Transfer to Stage 1 18
Transfer to Stage 2 (87)
Transfer to Stage 3 (80)
Impact on year end ECL of exposures transferred between stages during the year 200
Foreign exchange adjustments 1
Total 509
Accumulated Amortization | Lifetime expected credit losses | Financial instruments not credit-impaired | Individual  
Contingencies and Commitments  
Exposure as at beginning of period 947
Net change on exposures (113)
Transfer to Stage 2 442
Transfer to Stage 3 (86)
Impact on year end ECL of exposures transferred between stages during the year (444)
Foreign exchange adjustments 19
Total 765
Accumulated Amortization | Lifetime expected credit losses | Financial instruments not credit-impaired | Group  
Contingencies and Commitments  
Net change on exposures (2)
Transfer to Stage 2 90
Impact on year end ECL of exposures transferred between stages during the year (88)
Accumulated Amortization | Lifetime expected credit losses | Financial instruments credit-impaired | Individual  
Contingencies and Commitments  
Exposure as at beginning of period 470
Net change on exposures (310)
Transfer to Stage 2 (3)
Transfer to Stage 3 86
Impact on year end ECL of exposures transferred between stages during the year 250
Foreign exchange adjustments 2
Total 495
Accumulated Amortization | Lifetime expected credit losses | Financial instruments credit-impaired | Group  
Contingencies and Commitments  
Exposure as at beginning of period 34
Net change on exposures (11)
Transfer to Stage 1 (18)
Transfer to Stage 2 (3)
Transfer to Stage 3 80
Impact on year end ECL of exposures transferred between stages during the year (79)
Total $ 3