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Investments in Other Companies - Unconsolidated structured entities (Details)
$ in Thousands, $ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
Dec. 31, 2017
CLP ($)
Dec. 31, 2016
CLP ($)
Dec. 31, 2015
CLP ($)
Reconciliation of investments in unconsolidated companies        
Balance at beginning of the period   $ 30,314 $ 25,849 $ 23,043
Capital increase     1,129 314
Participation in net income $ 8,955 5,511 4,019 3,243
Dividends received (786) (484) (667) (663)
Other   430 (16) (88)
Balance at end of the period $ 58,124 35,771 30,314 $ 25,849
Impairment incurred   $ 0 $ 0