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Employee Benefits (Details) - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of defined benefit plans [line items]      
Short-term personnel benefits (a.2) $ 51,051 $ 47,797 $ 43,372
Vacation accrual (a.3) 27,609 26,855 25,159
Employee defined benefit plan (a.1) 7,566 [1] 7,754 [1] 7,676
Other Benefits 22,849 10,173  
Total 109,075 92,579  
Staff Severance Indemnities Plan [Member]      
Disclosure of defined benefit plans [line items]      
Employee defined benefit plan (a.1)   $ 7,676
Current service cost 101 250  
Interest cost on benefit obligation 222 300  
Actuarial gains and losses 247 127  
Net benefit expense $ 570 $ 677  
Discount rate 3.17% 4.25%  
Annual salary increase 4.42% 4.42%  
Payment probability 99.99% 99.99%  
[1] See Note No. 2 (x) (iii).