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Provisions - Changes in Provisions (Details) - CLP ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Changes in provisions    
Beginning Balance $ 203,946 $ 217,512
Provisions established 177,935 180,506
Provisions used (178,507) (192,151)
Provisions released (1,921)
Ending Balance 203,374 203,946
Minimum dividends    
Changes in provisions    
Beginning Balance   172,804
Provisions established 177,902 178,462
Provisions used (178,462) (172,804)
Provisions released
Contingent loan risks    
Changes in provisions    
Beginning Balance   22,975
Provisions established 2,041
Provisions used (45)
Provisions released
Other    
Changes in provisions    
Beginning Balance 468 21,733
Provisions established 33 3
Provisions used (19,347)
Provisions released (1,921)
Ending Balance $ 501 $ 468