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Property and Equipment and Leased assets and lease liabilities - Cost (Details) - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of changes in Property and equipment      
Beginning Balance $ 215,872    
Impairment loss (2,018) $ (334) $ (166)
Ending Balance 220,262 215,872  
Gross Balance      
Reconciliation of changes in Property and equipment      
Beginning Balance 557,305 548,349  
Reclassification (25,691)  
Additions 43,512 28,065  
Disposals/write-downs/sales (9,314) (18,775)  
Impairment loss [2] (1,069) [1] (334)  
Ending Balance 564,743 557,305 548,349
Gross Balance | Land and Buildings      
Reconciliation of changes in Property and equipment      
Beginning Balance 320,585 311,428  
Reclassification (25,654)  
Additions 12,555 12,589  
Disposals/write-downs/sales (5,437) (3,145)  
Impairment loss [2] (430) [1] (287)  
Ending Balance 301,619 320,585 311,428
Gross Balance | Equipment      
Reconciliation of changes in Property and equipment      
Beginning Balance 183,220 184,369  
Reclassification (37)  
Additions 28,118 12,702  
Disposals/write-downs/sales (3,115) (13,845)  
Impairment loss [2] (581) [1] (6)  
Ending Balance 207,605 183,220 184,369
Gross Balance | Other      
Reconciliation of changes in Property and equipment      
Beginning Balance 53,500 52,552  
Reclassification  
Additions 2,839 2,774  
Disposals/write-downs/sales (762) (1,785)  
Impairment loss [2] (58) [1] (41)  
Ending Balance $ 55,519 $ 53,500 $ 52,552
[1] It does not include charge-off provisions for Property and Equipment for an amount of Ch$949 million.
[2] See Note No. 36 about Depreciation, Amortization and Impairment