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Employee Benefits (Details 5) - Age
Dec. 31, 2017
Dec. 31, 2016
Chile [Member]    
Disclosure Of Employee Benefits [Line Items]    
Actuarial assumption of discount rates 5.96% 5.52%
Acturial assumption of voluntary employee turnover rate 1.90 1.90
Acturial assumption of rotation rate 5.30 5.30
Actuarial assumption of expected rates of salary increases [1] 3.70% 3.70%
Chile [Member] | Officers [Member]    
Disclosure Of Employee Benefits [Line Items]    
Actuarial assumption of retirement age 60 60
Chile [Member] | Other employees Male [Member]    
Disclosure Of Employee Benefits [Line Items]    
Actuarial assumption of retirement age [1] 65 65
Chile [Member] | Other employees Female [Member]    
Disclosure Of Employee Benefits [Line Items]    
Actuarial assumption of retirement age 60 60
Argentina [Member]    
Disclosure Of Employee Benefits [Line Items]    
Actuarial assumption of discount rates 24.55% 31.88%
Acturial assumption of voluntary employee turnover rate 50 50
Acturial assumption of rotation rate 50 50
Actuarial assumption of expected rates of salary increases [1] 18.68% 26.25%
Argentina [Member] | Officers [Member]    
Disclosure Of Employee Benefits [Line Items]    
Actuarial assumption of retirement age 60 60
Argentina [Member] | Other employees Male [Member]    
Disclosure Of Employee Benefits [Line Items]    
Actuarial assumption of retirement age [1] 65 65
Argentina [Member] | Other employees Female [Member]    
Disclosure Of Employee Benefits [Line Items]    
Actuarial assumption of retirement age 60 60
[1] Average of the Company.