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Property and Equipment and Leased assets and lease liabilities - Rights over leased assets (Details) - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Property and Equipment    
Gross Balance $ 220,262 $ 215,872
Property and equipment, Accumulated Depreciation (344,481) (341,433)
Net Balance 220,262 $ 215,872
Buildings    
Property and Equipment    
Gross Balance 130,853  
Property and equipment, Accumulated Depreciation (18,722)  
Net Balance 112,131  
Floor space for ATMs    
Property and Equipment    
Gross Balance 41,960  
Property and equipment, Accumulated Depreciation (9,091)  
Net Balance 32,869  
Improvements to leased properties    
Property and Equipment    
Gross Balance 27,254  
Property and equipment, Accumulated Depreciation (21,589)  
Net Balance 5,665  
Total [Member]    
Property and Equipment    
Gross Balance 200,067  
Property and equipment, Accumulated Depreciation (49,402)  
Net Balance $ 150,665