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Employee Benefits - Changes in the present value defined benefit obligation, incentive plans and vacation (Details) - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Changes in present value of defined benefit obligation    
Opening defined benefit obligation, January 1, $ 7,754 [1] $ 7,676
Closing defined benefit obligation [1] 7,566 7,754
Changes in provisions for incentive plans    
Balances as of January 1, 47,797 43,372
Provisions established 45,792 40,058
Provisions used (42,538) (35,633)
Provisions released
Balances as of December 31, 51,051 47,797
Changes in provisions for vacation    
Balances as of January 1, 26,855 25,159
Provisions established 7,257 7,529
Provisions used (6,503) (5,833)
Provisions released
Balances as of December 31, 27,609 26,855
Staff Severance Indemnities Plan    
Changes in present value of defined benefit obligation    
Opening defined benefit obligation, January 1, 7,676
Increase (Decrease) in provision 323 550
Benefits paid (758) (599)
Actuarial gains and losses $ 247 127
Closing defined benefit obligation  
[1] See Note No. 2 (x) (iii).