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Provisions - Analysis of changes in exposures - Foreign office guarantees and standby letters of credit (Details) - Foreign office guarantees and standby letters of credit
$ in Millions
 12 Months Ended
Dec. 31, 2018
CLP ($)
Contingencies and Commitments  
Exposure as at beginning of period $ 285,035
Total 341,676
12-month expected credit losses | Financial instruments not credit-impaired | Individual  
Contingencies and Commitments  
Total 332,965
12-month expected credit losses | Financial instruments not credit-impaired | Group  
Contingencies and Commitments  
Total 138
Lifetime expected credit losses | Financial instruments not credit-impaired | Individual  
Contingencies and Commitments  
Total 8,573
Gross Balance  
Contingencies and Commitments  
Exposure as at beginning of period 285,035
Net change on exposures 29,677
Foreign exchange adjustments 26,964
Total 341,676
Gross Balance | 12-month expected credit losses | Financial instruments not credit-impaired | Individual  
Contingencies and Commitments  
Exposure as at beginning of period 274,563
Net change on exposures 33,660
Transfer to Stage 1 4,994
Transfer to Stage 2 (6,513)
Foreign exchange adjustments 26,261
Total 332,965
Gross Balance | 12-month expected credit losses | Financial instruments not credit-impaired | Group  
Contingencies and Commitments  
Exposure as at beginning of period 84
Net change on exposures 24
Foreign exchange adjustments 30
Total 138
Gross Balance | Lifetime expected credit losses | Financial instruments not credit-impaired | Individual  
Contingencies and Commitments  
Exposure as at beginning of period 10,388
Net change on exposures (4,139)
Transfer to Stage 1 (4,855)
Transfer to Stage 2 6,513
Foreign exchange adjustments 666
Total 8,573
Gross Balance | Lifetime expected credit losses | Financial instruments credit-impaired | Individual  
Contingencies and Commitments  
Net change on exposures 132
Transfer to Stage 1 (139)
Foreign exchange adjustments 7
Accumulated Amortization  
Contingencies and Commitments  
Exposure as at beginning of period 256
Net change on exposures 208
Impact on year end ECL of exposures transferred between stages during the year (70)
Foreign exchange adjustments 34
Total 428
Accumulated Amortization | 12-month expected credit losses | Financial instruments not credit-impaired | Individual  
Contingencies and Commitments  
Exposure as at beginning of period 256
Net change on exposures 152
Transfer to Stage 1 60
Transfer to Stage 2 (14)
Impact on year end ECL of exposures transferred between stages during the year (56)
Foreign exchange adjustments 30
Total 428
Accumulated Amortization | 12-month expected credit losses | Financial instruments not credit-impaired | Group  
Contingencies and Commitments  
Net change on exposures (1)
Foreign exchange adjustments 1
Accumulated Amortization | Lifetime expected credit losses | Financial instruments not credit-impaired | Individual  
Contingencies and Commitments  
Transfer to Stage 2 14
Impact on year end ECL of exposures transferred between stages during the year (14)
Accumulated Amortization | Lifetime expected credit losses | Financial instruments credit-impaired | Individual  
Contingencies and Commitments  
Net change on exposures 57
Transfer to Stage 1 (60)
Foreign exchange adjustments $ 3