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Risk Management - Renegotiated Assets (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2019
CLP ($)
Facilities that have cured since modification and are now measured using 12mECLs (Stage 1)  
Disclosure of renegotiated assets [line items]  
Gross carrying amount, Post modification $ 32,105
Corresponding ECL, Post modification 3,668
Gross carrying amount, Pre-modification 32,870
Corresponding ECL, Pre-modification 7,577
Facilities that reverted to (Stage 2/3) lifetime ECLs having once cured  
Disclosure of renegotiated assets [line items]  
Gross carrying amount, Post modification 4,043
Corresponding ECL, Post modification 1,132
Gross carrying amount, Pre-modification 3,927
Corresponding ECL, Pre-modification $ 613