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PROVISIONS AND CONTINGENT PROVISIONS (Details 3)
$ in Millions
 12 Months Ended
Dec. 31, 2018
CLP ($)
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]  
ECL allowance, beginning balance $ 23,761
Transfers to stage 2 35
Transfers to stage 3 327
Transfers to stage 3 556
Transfers to stage 1 (6)
Transfers to stage 2
Transfers to stage 1 (1)
Net changes on financial assets 741
Writte-off
Foreign Exchange adjustments (1,704)
ECL allowance, ending balance 23,709
Stage 1 [Member] | Individual [Member]  
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]  
ECL allowance, beginning balance 1,028
Transfers to stage 2 (30)
Transfers to stage 3 (1)
Transfers to stage 3
Transfers to stage 1 1
Transfers to stage 2
Transfers to stage 1
Net changes on financial assets 115
Writte-off
Foreign Exchange adjustments (32)
ECL allowance, ending balance 1,081
Stage 1 [Member] | Collective [Member]  
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]  
ECL allowance, beginning balance 16,261
Transfers to stage 2
Transfers to stage 3
Transfers to stage 3
Transfers to stage 1
Transfers to stage 2
Transfers to stage 1
Net changes on financial assets 683
Writte-off
Foreign Exchange adjustments (1,874)
ECL allowance, ending balance 15,070
Stage 2 [Member] | Individual [Member]  
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]  
ECL allowance, beginning balance 219
Transfers to stage 2 65
Transfers to stage 3
Transfers to stage 3 (11)
Transfers to stage 1 (7)
Transfers to stage 2
Transfers to stage 1
Net changes on financial assets 3
Writte-off
Foreign Exchange adjustments (10)
ECL allowance, ending balance 259
Stage 2 [Member] | Collective [Member]  
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]  
ECL allowance, beginning balance 187
Transfers to stage 2
Transfers to stage 3
Transfers to stage 3
Transfers to stage 1
Transfers to stage 2
Transfers to stage 1
Net changes on financial assets (37)
Writte-off
Foreign Exchange adjustments 22
ECL allowance, ending balance 172
Stage 3 [Member] | Individual [Member]  
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]  
ECL allowance, beginning balance 2,884
Transfers to stage 2
Transfers to stage 3 328
Transfers to stage 3 567
Transfers to stage 1
Transfers to stage 2
Transfers to stage 1 (1)
Net changes on financial assets 54
Writte-off
Foreign Exchange adjustments 24
ECL allowance, ending balance 3,856
Stage 3 [Member] | Collective [Member]  
Disclosure of reconciliation of changes in loss allowance and explanation of changes in gross carrying amount for financial instruments [line items]  
ECL allowance, beginning balance 3,182
Transfers to stage 2
Transfers to stage 3
Transfers to stage 3
Transfers to stage 1
Transfers to stage 2
Transfers to stage 1
Net changes on financial assets (77)
Writte-off
Foreign Exchange adjustments 166
ECL allowance, ending balance $ 3,271