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Provisions - Analysis of changes in exposures - Confirmed foreign letters of credit (Details) - Confirmed foreign letters of credit
$ in Millions
 12 Months Ended
Dec. 31, 2018
CLP ($)
Contingencies and Commitments  
Exposure as at beginning of period $ 64,970
Total 56,764
12-month expected credit losses | Financial instruments not credit-impaired | Individual  
Contingencies and Commitments  
Total 56,764
Gross Balance  
Contingencies and Commitments  
Exposure as at beginning of period 64,970
Net change on exposures (15,447)
Foreign exchange adjustments 7,241
Total 56,764
Gross Balance | 12-month expected credit losses | Financial instruments not credit-impaired | Individual  
Contingencies and Commitments  
Exposure as at beginning of period 64,970
Net change on exposures (15,455)
Foreign exchange adjustments 7,249
Total 56,764
Gross Balance | Lifetime expected credit losses | Financial instruments not credit-impaired | Individual  
Contingencies and Commitments  
Net change on exposures 8
Foreign exchange adjustments (8)
Accumulated Amortization  
Contingencies and Commitments  
Exposure as at beginning of period 23
Net change on exposures 3
Foreign exchange adjustments 3
Total 29
Accumulated Amortization | 12-month expected credit losses | Financial instruments not credit-impaired | Individual  
Contingencies and Commitments  
Exposure as at beginning of period 23
Net change on exposures 3
Foreign exchange adjustments 3
Total $ 29