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Contingencies and Commitments - Lawsuits and legal proceedings (Details) - CLP ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Contingencies and Commitments    
Provision for legal contingencies $ 204 $ 21,470
Due within 1 year    
Contingencies and Commitments    
Provision for legal contingencies 24  
2 years    
Contingencies and Commitments    
Provision for legal contingencies $ 180