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Derivative Instruments and Accounting Hedges - CLF assets hedged (Details)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CLP ($)
item
Dec. 31, 2017
CLP ($)
item
Dec. 31, 2016
CLP ($)
CLF Assets hedged        
Accumulated amount of unrealized gain charged to equity, before tax $ (44,612) $ (30,943) $ 14,979 $ (50,481)
Cash flow hedge adjustment, net   (22,589) 11,158 (38,366)
Cash Flow hedge | Cash flow in CLF        
CLF Assets hedged        
Accumulated amount of unrealized gain charged to equity, before tax   30,943 14,979 50,481
Cash flow hedge adjustment, net   (22,589) 11,158 (38,366)
Accumulated amount of unrealized gain charged to equity, after income tax   (31,983) (9,394) 20,552
Net effect in income of derivatives   $ 85,659 $ 93,612 $ 135,929
Number of hedges of net investments in foreign businesses | item   0 0