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Provisions - Analysis of changes in exposures - Other commitments (Details) - Other commitments
$ in Millions
 12 Months Ended
Dec. 31, 2018
CLP ($)
Contingencies and Commitments  
Exposure as at beginning of period $ 60,609
Total 46,561
12-month expected credit losses | Financial instruments not credit-impaired | Individual  
Contingencies and Commitments  
Total 46,561
Gross Balance  
Contingencies and Commitments  
Exposure as at beginning of period 60,609
Net change on exposures (14,048)
Total 46,561
Gross Balance | 12-month expected credit losses | Financial instruments not credit-impaired | Individual  
Contingencies and Commitments  
Exposure as at beginning of period 49,519
Net change on exposures (2,958)
Total 46,561
Gross Balance | Lifetime expected credit losses | Financial instruments not credit-impaired | Individual  
Contingencies and Commitments  
Exposure as at beginning of period 11,090
Net change on exposures $ (11,090)