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Intangible Assets - Gross Balance (Details) - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill at beginning of period $ 85,471  
Intangible assets and goodwill at end of period 91,717 $ 85,471
Goodwill generated in the business combination   85,471
Gross Balance    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill at beginning of period 217,931 195,443
Acquisitions 20,928 23,512
Disposals (1,759) (1,024)
Reclassification (276)  
Impairment loss (350)
Intangible assets and goodwill at end of period 236,474 217,931
Gross Balance | Goodwill    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill at beginning of period 16,714 16,714
Acquisitions
Disposals
Reclassification  
Impairment loss
Intangible assets and goodwill at end of period 16,714 16,714
Gross Balance | 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 56,249 56,249
Acquisitions
Disposals
Reclassification  
Impairment loss
Intangible assets and goodwill at end of period 56,249 56,249
Goodwill generated in the business combination 16,696 16,696
Gross Balance | Software or computer programs    
Disclosure of reconciliation of changes in intangible assets and goodwill [line items]    
Intangible assets and goodwill at beginning of period 144,968 122,480
Acquisitions 20,928 23,512
Disposals (1,759) (1,024)
Reclassification (276)  
Impairment loss (350)
Intangible assets and goodwill at end of period 163,511 144,968
Goodwill generated in the business combination $ 58,307 $ 52,061