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EXPECTED CREDIT LOSSESS ALLOWANCE (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2018
CLP ($)
Disclosure of financial assets [line items]  
Total $ (317,408)
Individual [Member] | Stage 1 [Member]  
Disclosure of financial assets [line items]  
Total 353
Individual [Member] | Stage 2 [Member]  
Disclosure of financial assets [line items]  
Total (2,811)
Individual [Member] | Stage 3 [Member]  
Disclosure of financial assets [line items]  
Total (96,356)
Collective [Member] | Stage 1 [Member]  
Disclosure of financial assets [line items]  
Total 14,376
Collective [Member] | Stage 2 [Member]  
Disclosure of financial assets [line items]  
Total 3,752
Collective [Member] | Stage 3 [Member]  
Disclosure of financial assets [line items]  
Total (236,722)
Commercial Loans [Member]  
Disclosure of financial assets [line items]  
Total (142,782)
Commercial Loans [Member] | Individual [Member] | Stage 1 [Member]  
Disclosure of financial assets [line items]  
Total 79
Commercial Loans [Member] | Individual [Member] | Stage 2 [Member]  
Disclosure of financial assets [line items]  
Total (2,891)
Commercial Loans [Member] | Individual [Member] | Stage 3 [Member]  
Disclosure of financial assets [line items]  
Total (96,131)
Commercial Loans [Member] | Collective [Member] | Stage 1 [Member]  
Disclosure of financial assets [line items]  
Total 5,652
Commercial Loans [Member] | Collective [Member] | Stage 2 [Member]  
Disclosure of financial assets [line items]  
Total (1,533)
Commercial Loans [Member] | Collective [Member] | Stage 3 [Member]  
Disclosure of financial assets [line items]  
Total (47,959)
Mortgage Loans [Member]  
Disclosure of financial assets [line items]  
Total 14,119
Mortgage Loans [Member] | Individual [Member] | Stage 1 [Member]  
Disclosure of financial assets [line items]  
Total
Mortgage Loans [Member] | Individual [Member] | Stage 2 [Member]  
Disclosure of financial assets [line items]  
Total
Mortgage Loans [Member] | Individual [Member] | Stage 3 [Member]  
Disclosure of financial assets [line items]  
Total
Mortgage Loans [Member] | Collective [Member] | Stage 1 [Member]  
Disclosure of financial assets [line items]  
Total 5,583
Mortgage Loans [Member] | Collective [Member] | Stage 2 [Member]  
Disclosure of financial assets [line items]  
Total 5,161
Mortgage Loans [Member] | Collective [Member] | Stage 3 [Member]  
Disclosure of financial assets [line items]  
Total 3,375
Consumer Loans [Member]  
Disclosure of financial assets [line items]  
Total (189,251)
Consumer Loans [Member] | Individual [Member] | Stage 1 [Member]  
Disclosure of financial assets [line items]  
Total
Consumer Loans [Member] | Individual [Member] | Stage 2 [Member]  
Disclosure of financial assets [line items]  
Total
Consumer Loans [Member] | Individual [Member] | Stage 3 [Member]  
Disclosure of financial assets [line items]  
Total
Consumer Loans [Member] | Collective [Member] | Stage 1 [Member]  
Disclosure of financial assets [line items]  
Total 1,861
Consumer Loans [Member] | Collective [Member] | Stage 2 [Member]  
Disclosure of financial assets [line items]  
Total 192
Consumer Loans [Member] | Collective [Member] | Stage 3 [Member]  
Disclosure of financial assets [line items]  
Total (191,304)
Contingent Loans [Member]  
Disclosure of financial assets [line items]  
Total 9
Contingent Loans [Member] | Individual [Member] | Stage 1 [Member]  
Disclosure of financial assets [line items]  
Total (90)
Contingent Loans [Member] | Individual [Member] | Stage 2 [Member]  
Disclosure of financial assets [line items]  
Total 11
Contingent Loans [Member] | Individual [Member] | Stage 3 [Member]  
Disclosure of financial assets [line items]  
Total (225)
Contingent Loans [Member] | Collective [Member] | Stage 1 [Member]  
Disclosure of financial assets [line items]  
Total 1,214
Contingent Loans [Member] | Collective [Member] | Stage 2 [Member]  
Disclosure of financial assets [line items]  
Total (68)
Contingent Loans [Member] | Collective [Member] | Stage 3 [Member]  
Disclosure of financial assets [line items]  
Total (834)
Loans And Account Receivable At FVOCI [Member]  
Disclosure of financial assets [line items]  
Total 431
Loans And Account Receivable At FVOCI [Member] | Individual [Member] | Stage 1 [Member]  
Disclosure of financial assets [line items]  
Total 363
Loans And Account Receivable At FVOCI [Member] | Individual [Member] | Stage 2 [Member]  
Disclosure of financial assets [line items]  
Total 68
Loans And Account Receivable At FVOCI [Member] | Individual [Member] | Stage 3 [Member]  
Disclosure of financial assets [line items]  
Total
Loans And Account Receivable At FVOCI [Member] | Collective [Member] | Stage 1 [Member]  
Disclosure of financial assets [line items]  
Total
Loans And Account Receivable At FVOCI [Member] | Collective [Member] | Stage 2 [Member]  
Disclosure of financial assets [line items]  
Total
Loans And Account Receivable At FVOCI [Member] | Collective [Member] | Stage 3 [Member]  
Disclosure of financial assets [line items]  
Total
Debt At FVOCI [Member]  
Disclosure of financial assets [line items]  
Total 66
Debt At FVOCI [Member] | Individual [Member] | Stage 1 [Member]  
Disclosure of financial assets [line items]  
Total
Debt At FVOCI [Member] | Individual [Member] | Stage 2 [Member]  
Disclosure of financial assets [line items]  
Total
Debt At FVOCI [Member] | Individual [Member] | Stage 3 [Member]  
Disclosure of financial assets [line items]  
Total
Debt At FVOCI [Member] | Collective [Member] | Stage 1 [Member]  
Disclosure of financial assets [line items]  
Total 66
Debt At FVOCI [Member] | Collective [Member] | Stage 2 [Member]  
Disclosure of financial assets [line items]  
Total
Debt At FVOCI [Member] | Collective [Member] | Stage 3 [Member]  
Disclosure of financial assets [line items]  
Total