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Net Foreign Exchange Gain (Loss) (Details) - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Net foreign exchange gain (loss)      
Net profit (loss) from currency exchange differences $ (89,893) $ (212,618) $ 113,115
Hedging derivatives 362,374 252,275 22,933
Income from assets indexed to foreign currency 7,376 12,251 (9,190)
Income from liabilities indexed to foreign currency 98
Total $ 279,857 $ 51,908 $ 126,956