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Financial Assets at Fair Value through Other Comprehensive Income - Analysis of changes (Details) - CLP ($)
$ in Millions
 12 Months Ended
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.