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Intangible Assets - Accumulated Amortization (Details) - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill at beginning of period $ 85,471    
Amortization for the year (12,875) $ (10,496) $ (11,360)
Intangible assets and goodwill at end of period 91,717 85,471  
Accumulated Amortization      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill at beginning of period (132,460) (122,988)  
Amortization for the year (12,875) (10,496)  
Disposals 316 1,024  
Reclassification 262    
Intangible assets and goodwill at end of period (144,757) (132,460) (122,988)
Accumulated Amortization | Software or computer programs      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill at beginning of period (92,907) (83,435)  
Amortization for the year (12,875) (10,496)  
Disposals 316 1,024  
Reclassification 262    
Intangible assets and goodwill at end of period (105,204) (92,907) (83,435)
Accumulated Amortization | Goodwill      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill at beginning of period  
Amortization for the year  
Disposals  
Reclassification    
Intangible assets and goodwill at end of period
Accumulated Amortization | Intangible assets arising from business combinations      
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]      
Intangible assets and goodwill at beginning of period (39,553) (39,553)  
Amortization for the year  
Disposals  
Reclassification    
Intangible assets and goodwill at end of period $ (39,553) $ (39,553) $ (39,553)