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Derivative Instruments and Accounting Hedges (Details)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2020
CLP ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CLP ($)
Dec. 31, 2018
CLP ($)
Derivative Instruments and Accounting Hedges (Details) [Line Items]        
Accumulated amount of unrealized gain charged to equity, before tax $ 10,358 $ 14,550 $ (37,546) $ (30,943)
Cash flow hedge adjustment, net 7,561   (27,408) (22,589)
Effect of the cash flow hedging derivatives 39,449   84,684 85,659
Cash flow hedges [member] | Cash flow in CLF        
Derivative Instruments and Accounting Hedges (Details) [Line Items]        
Accumulated amount of unrealized gain charged to equity, before tax 10,358   (37,546) (30,943)
Cash flow hedge adjustment, net 7,561   (27,408) (22,589)
Accumulated amount of unrealized gain charged to equity, net of income tax $ 51,830   $ 59,391 $ 31,983