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Property and Equipment - Cost (Details)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CLP ($)
Dec. 31, 2017
CLP ($)
Dec. 31, 2016
CLP ($)
Reconciliation of changes in Property and equipment        
Property, plant and equipment at beginning of period   $ 216,259    
Impairment loss   (334) $ (166) $ (274)
Property, plant and equipment at end of period $ 311,234 215,872 216,259  
Gross Balance        
Reconciliation of changes in Property and equipment        
Property, plant and equipment at beginning of period   548,349 532,913  
Additions   28,065 23,224  
Disposals/write-downs/sales   (18,775) (7,785)  
Accumulated depreciation (see (a.2))   (341,433) (332,090)  
Impairment loss   (334) (3)  
Property, plant and equipment after considering accumulated depreciation   215,872 216,259  
Property, plant and equipment at end of period     548,349 532,913
Gross Balance | Land and Buildings        
Reconciliation of changes in Property and equipment        
Property, plant and equipment at beginning of period   311,428 302,187  
Additions   12,589 10,606  
Disposals/write-downs/sales   (3,145) (1,365)  
Accumulated depreciation (see (a.2))   (150,099) (142,768)  
Impairment loss   (287)    
Property, plant and equipment after considering accumulated depreciation   170,486 168,660  
Property, plant and equipment at end of period     311,428 302,187
Gross Balance | Equipment        
Reconciliation of changes in Property and equipment        
Property, plant and equipment at beginning of period   184,369 180,322  
Additions   12,702 8,898  
Disposals/write-downs/sales   (13,845) (4,851)  
Accumulated depreciation (see (a.2))   (148,455) (148,006)  
Impairment loss   (6)    
Property, plant and equipment after considering accumulated depreciation   34,765 36,363  
Property, plant and equipment at end of period     184,369 180,322
Gross Balance | Other        
Reconciliation of changes in Property and equipment        
Property, plant and equipment at beginning of period   52,552 50,404  
Additions   2,774 3,720  
Disposals/write-downs/sales   (1,785) (1,569)  
Accumulated depreciation (see (a.2))   (42,879) (41,316)  
Impairment loss   (41) (3)  
Property, plant and equipment after considering accumulated depreciation   $ 10,621 11,236  
Property, plant and equipment at end of period     $ 52,552 $ 50,404