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Property and Equipment and Leased Assets and Lease Liabilities (Details) - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Property and Equipment    
Property and equipment, Gross balance $ 564,743 $ 557,305
Property and equipment, Accumulated Depreciation (344,481) (341,433)
Property and equipment, Net balance $ 220,262 $ 215,872
Land and buildings [member]    
Property and Equipment    
Property and equipment, Useful Life 26 years 26 years
Property and equipment, Average remaining depreciation 21 years 21 years
Property and equipment, Gross balance $ 301,619 $ 320,585
Property and equipment, Accumulated Depreciation (136,394) (150,099)
Property and equipment, Net balance $ 165,225 $ 170,486
Equipment    
Property and Equipment    
Property and equipment, Useful Life 5 years 5 years
Property and equipment, Average remaining depreciation 4 years 3 years
Property and equipment, Gross balance $ 207,605 $ 183,220
Property and equipment, Accumulated Depreciation (162,560) (148,455)
Property and equipment, Net balance $ 45,045 $ 34,765
Other    
Property and Equipment    
Property and equipment, Useful Life 7 years 7 years
Property and equipment, Average remaining depreciation 4 years 4 years
Property and equipment, Gross balance $ 55,519 $ 53,500
Property and equipment, Accumulated Depreciation (45,527) (42,879)
Property and equipment, Net balance $ 9,992 $ 10,621