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Financial Assets at Fair Value through Other Comprehensive Income - Analysis of changes (Details) - CLP ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Disclosure of financial assets [line items] |  |  |
Financial assets available-for-sale |  | $ 1,366,343 | $ 1,053,191
Financial assets at fair value through other comprehensive income |  | 1,366,343 | 1,053,191
Individual [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets at beginning of period |  | 1,012 | 772
Transfer to Stage 1 |  |  |
Transfer to Stage 2 |  |  |
Transfer to Stage 3 |  |  |
Impact on year-end ECL of exposures transferred between stages during the year | [1] |  | 3
Amounts written off |  |  |
Foreign exchange adjustments |  | (22) | (22)
Net change on financial assets | [2] | (880) | 259
Financial assets at end of period |  | 110 | 1,012
Debt instruments valued at fair value |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets at beginning of period |  | 1,043,440 |
Financial assets at end of period |  | 1,357,846 | 1,043,440
Financial assets available-for-sale |  | 1,357,846 | 1,043,440
Financial assets at fair value through other comprehensive income |  | 1,357,846 | 1,043,440
Debt instruments valued at fair value | Accumulated Amortization |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets at beginning of period |  | 4,268 |
Financial assets at end of period |  |  | 4,268
Debt instruments valued at fair value | Fair Value |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets at beginning of period |  | 1,043,440 | 1,516,063
Change in fair value |  | 32,995 | 14,162
Foreign exchange adjustments |  | 5,633 | 28,558
Net change on financial assets | [3] | 275,778 | (515,343)
Financial assets at end of period |  |  | 1,043,440
Debt instruments valued at fair value | Individual [Member] |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets at beginning of period |  | 4,268 |
Transfer to Stage 2 |  | (1) |
Impact of net re-measurement of year-end ECL |  | 3,102 | 258
Foreign exchange adjustments |  | 40 | 168
Net change on financial assets | [3] | 327 | (1,978)
Financial assets at end of period |  | 7,736 | 4,268
Debt instruments valued at fair value | Investment grade |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets available-for-sale |  |  |
Financial assets at fair value through other comprehensive income |  | 1,269,516 | 827,770
Debt instruments valued at fair value | Without rating |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets available-for-sale |  |  |
Financial assets at fair value through other comprehensive income |  | 88,330 | 215,670
Debt instruments valued at fair value | Financial instruments not credit-impaired | Individual [Member] | 12-month expected credit losses |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets at fair value through other comprehensive income |  | 1,357,846 | 1,043,440
Debt instruments valued at fair value | Financial instruments not credit-impaired | Individual [Member] | 12-month expected credit losses | Accumulated Amortization |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets at beginning of period |  | 4,268 | 5,820
Impact of net re-measurement of year-end ECL |  | 3,102 | 258
Foreign exchange adjustments |  | 40 | 168
Net change on financial assets | [3] | 326 | (1,978)
Financial assets at end of period |  | 7,736 | 4,268
Debt instruments valued at fair value | Financial instruments not credit-impaired | Individual [Member] | 12-month expected credit losses | Fair Value |  |  |
Disclosure of financial assets [line items] |  |  |
Change in fair value |  | 32,995 | 14,162
Transfer to Stage 2 |  | (19) |
Foreign exchange adjustments |  | 5,633 | 28,558
Net change on financial assets | [3] | 275,797 | (515,343)
Debt instruments valued at fair value | Financial instruments not credit-impaired | Investment grade | Individual [Member] | 12-month expected credit losses |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets at fair value through other comprehensive income |  | 1,269,516 | 827,770
Debt instruments valued at fair value | Financial instruments not credit-impaired | Without rating | Individual [Member] | 12-month expected credit losses |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets at fair value through other comprehensive income |  | 88,330 | 215,670
Equity instruments valued at fair value |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets available-for-sale |  | 8,497 | 9,751
Financial assets at fair value through other comprehensive income |  |  | 9,751
Equity instruments valued at fair value | Instruments issued by foreign institutions |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets at fair value through other comprehensive income |  | 1,051 | 812
Equity instruments valued at fair value | Other instruments issued in Chile |  |  |
Disclosure of financial assets [line items] |  |  |
Financial assets at fair value through other comprehensive income |  | $ 8,497 | $ 9,751
[1] | Represents the change in the year-end ECLs of exposures that were transferred from one stage to another during the year.
[2] | Net change between assets originated and assets repaid, excluding write offs.
[3] | Net change between assets purchased and assets derecognized, excluding write offs.

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