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Provisions - Analysis of changes in exposures - Issued foreign letters of credit (Details) - Issued foreign letters of credit
$ in Millions
 12 Months Ended
Dec. 31, 2018
CLP ($)
Contingencies and Commitments  
Exposure as at beginning of period $ 94,313
Total 388,396
12-month expected credit losses | Financial instruments not credit-impaired | Individual  
Contingencies and Commitments  
Total 344,874
12-month expected credit losses | Financial instruments not credit-impaired | Group  
Contingencies and Commitments  
Total 1,585
Lifetime expected credit losses | Financial instruments not credit-impaired | Individual  
Contingencies and Commitments  
Total 41,823
Lifetime expected credit losses | Financial instruments not credit-impaired | Group  
Contingencies and Commitments  
Total 114
Gross Balance  
Contingencies and Commitments  
Exposure as at beginning of period 94,313
Net change on exposures 283,384
Foreign exchange adjustments 10,699
Total 388,396
Gross Balance | 12-month expected credit losses | Financial instruments not credit-impaired | Individual  
Contingencies and Commitments  
Exposure as at beginning of period 80,106
Net change on exposures 262,824
Transfer to Stage 1 6,268
Transfer to Stage 2 (13,420)
Foreign exchange adjustments 9,096
Total 344,874
Gross Balance | 12-month expected credit losses | Financial instruments not credit-impaired | Group  
Contingencies and Commitments  
Exposure as at beginning of period 1,737
Net change on exposures 832
Transfer to Stage 2 (1,098)
Foreign exchange adjustments 114
Total 1,585
Gross Balance | Lifetime expected credit losses | Financial instruments not credit-impaired | Individual  
Contingencies and Commitments  
Exposure as at beginning of period 11,984
Net change on exposures 21,226
Transfer to Stage 1 (6,268)
Transfer to Stage 2 13,420
Foreign exchange adjustments 1,461
Total 41,823
Gross Balance | Lifetime expected credit losses | Financial instruments not credit-impaired | Group  
Contingencies and Commitments  
Exposure as at beginning of period 486
Net change on exposures (1,498)
Transfer to Stage 2 1,098
Foreign exchange adjustments 28
Total 114
Accumulated Amortization  
Contingencies and Commitments  
Exposure as at beginning of period 49
Net change on exposures 44
Impact on year end ECL of exposures transferred between stages during the year (4)
Foreign exchange adjustments 4
Total 93
Accumulated Amortization | 12-month expected credit losses | Financial instruments not credit-impaired | Individual  
Contingencies and Commitments  
Exposure as at beginning of period 43
Net change on exposures 38
Transfer to Stage 2 (6)
Impact on year end ECL of exposures transferred between stages during the year 4
Foreign exchange adjustments 4
Total 83
Accumulated Amortization | 12-month expected credit losses | Financial instruments not credit-impaired | Group  
Contingencies and Commitments  
Exposure as at beginning of period 6
Net change on exposures 7
Transfer to Stage 2 (3)
Total 10
Accumulated Amortization | Lifetime expected credit losses | Financial instruments not credit-impaired | Individual  
Contingencies and Commitments  
Transfer to Stage 2 6
Impact on year end ECL of exposures transferred between stages during the year (6)
Accumulated Amortization | Lifetime expected credit losses | Financial instruments not credit-impaired | Group  
Contingencies and Commitments  
Net change on exposures (1)
Transfer to Stage 2 3
Impact on year end ECL of exposures transferred between stages during the year $ (2)