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Financial Assets at Fair Value through Other Comprehensive Income - Realized and unrealized profits (Details) - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of financial assets [line items]      
Net of tax amount $ 11,641 $ (10,121)  
Financial assets available-for-sale      
Disclosure of financial assets [line items]      
Net gain (loss) on financial assets before income tax 15,969 (13,878) $ 4,775
Tax (expense) benefit (4,328) 3,757 (1,299)
Net of tax amount 11,641 (10,121) 3,476
Realized gains reclassified to the income statement $ 4,716 $ 400 $ 5,149