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Property and Equipment - Operating Leases (Details) - CLP ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Operating lease agreements    
Expenses for the year $ 33,017,000,000 $ 34,490,000,000
Lease agreement payments $ 145,829,000,000 165,406,000,000
Average life 5 years  
Amount of property and equipment reported from finance lease agreements as lessee $ 0 0
Fully depreciated assets 225,641,000,000 215,356,000,000
Up to 1 month    
Operating lease agreements    
Lease agreement payments 2,764,000,000 2,750,000,000
Between 1 and 3 months    
Operating lease agreements    
Lease agreement payments 5,522,000,000 5,458,000,000
Between 3 and 12 months    
Operating lease agreements    
Lease agreement payments 23,462,000,000 22,841,000,000
Due after 1 years but within 3 years    
Operating lease agreements    
Lease agreement payments 45,891,000,000 51,242,000,000
Due after 3 years but within 5 years    
Operating lease agreements    
Lease agreement payments 33,789,000,000 36,213,000,000
Due after 5 years    
Operating lease agreements    
Lease agreement payments $ 34,401,000,000 $ 46,902,000,000