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Debt Issued - Subordinated bonds December 31, 2019 (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2019
CLP ($)
UCHI-J1111 [Member]  
Statement Line Items [Line Items]  
Currency UF
Amount $ 61,471
Terms Years 23 years
Annual issue rate 1.05%
Issue date Aug. 20, 2019
Maturity date Aug. 20, 2042
UCHI-J1111 [Member]  
Statement Line Items [Line Items]  
Currency UF
Amount $ 65,973
Terms Years 23 years
Annual issue rate 1.04%
Issue date Aug. 20, 2019
Maturity date Aug. 20, 2042
UCHI-J1111 [Member]  
Statement Line Items [Line Items]  
Currency UF
Amount $ 48,799
Terms Years 23 years
Annual issue rate 0.99%
Issue date Aug. 21, 2019
Maturity date Aug. 21, 2042
UCHI-I1111 [Member]  
Statement Line Items [Line Items]  
Currency UF
Amount $ 39,114
Terms Years 21 years
Annual issue rate 0.96%
Issue date Sep. 24, 2019
Maturity date Sep. 24, 2040
Total  
Statement Line Items [Line Items]  
Amount $ 215,357