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Contingencies and Commitments - Lawsuits and legal proceedings (Details) - CLP ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Disclosure of contingent liabilities [line items]    
Provision for legal contingencies $ 237 $ 204
2020 [Member]    
Disclosure of contingent liabilities [line items]    
Provision for legal contingencies 120  
2021 [Member]    
Disclosure of contingent liabilities [line items]    
Provision for legal contingencies 117  
2022 [Member]    
Disclosure of contingent liabilities [line items]    
Provision for legal contingencies  
2023 [Member]    
Disclosure of contingent liabilities [line items]    
Provision for legal contingencies