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Foreign Exchange Transactions, Net (Tables)
 12 Months Ended
Dec. 31, 2020
Disclosure of effect of changes in foreign exchange rates [text block] [Abstract]  
Schedule of foreign exchange transactions, net
   2018   2019   2020 
   MCh$   MCh$   MCh$ 
Gain (loss) from accounting hedges   118,690    113,374    (17,156)
Indexed foreign currency   (125,598)   (88,772)   176,469 
Exchange difference, net   9,609    6,284    (2,651)
Total   2,701    30,886    156,662