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Property and Equipment and Leased assets and lease liabilities - Future Maturities of the Lease Liabilities (Details)
$ in Millions
Dec. 31, 2019
CLP ($)
Statement Line Items [Line Items]  
Total $ 154,784
Up to 1 month [Member]  
Statement Line Items [Line Items]  
Total 2,535
Over 1 month and up to 3 months [Member]  
Statement Line Items [Line Items]  
Total 5,137
Over 3 months and up to 12 months [Member]  
Statement Line Items [Line Items]  
Total 22,417
Over 1 year and up to 3 years [Member]  
Statement Line Items [Line Items]  
Total 55,188
Over 5 years [Member]  
Statement Line Items [Line Items]  
Total 39,205
Over 3 years and up to 5 years  
Statement Line Items [Line Items]  
Total 30,302
Buildings [Member]  
Statement Line Items [Line Items]  
Total 121,019
Buildings [Member] | Up to 1 month [Member]  
Statement Line Items [Line Items]  
Total 1,726
Buildings [Member] | Over 1 month and up to 3 months [Member]  
Statement Line Items [Line Items]  
Total 3,519
Buildings [Member] | Over 3 months and up to 12 months [Member]  
Statement Line Items [Line Items]  
Total 15,286
Buildings [Member] | Over 1 year and up to 3 years [Member]  
Statement Line Items [Line Items]  
Total 37,063
Buildings [Member] | Over 3 years and up to 5 years [Member]  
Statement Line Items [Line Items]  
Total 24,899
Buildings [Member] | Over 5 years [Member]  
Statement Line Items [Line Items]  
Total 38,526
ATMs [Member]  
Statement Line Items [Line Items]  
Total 33,765
ATMs [Member] | Up to 1 month [Member]  
Statement Line Items [Line Items]  
Total 809
ATMs [Member] | Over 1 month and up to 3 months [Member]  
Statement Line Items [Line Items]  
Total 1,618
ATMs [Member] | Over 3 months and up to 12 months [Member]  
Statement Line Items [Line Items]  
Total 7,131
ATMs [Member] | Over 1 year and up to 3 years [Member]  
Statement Line Items [Line Items]  
Total 18,125
ATMs [Member] | Over 3 years and up to 5 years [Member]  
Statement Line Items [Line Items]  
Total 5,403
ATMs [Member] | Over 5 years [Member]  
Statement Line Items [Line Items]  
Total $ 679