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RISK MANAGEMENT (Details 19) - Liquidity Risk [Member] - Other Commercial Commitments [Member] - CLP ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Disclosure of financial liabilities [line items]    
Financial liabilities $ 2,638,286 $ 2,182,569
Not Later Than One Month [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 702,081 559,586
Later Than One Month And Not Later Than Three Months [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 371,475 407,158
More Than 3 Months To 1 Year [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 1,034,383 946,624
Between 1 and 5 Years [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 226,962 247,941
Due After 5 Years [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 33,385 21,260
Performance Guarantees [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 1,954,205 1,823,793
Performance Guarantees [Member] | Not Later Than One Month [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 663,642 514,510
Performance Guarantees [Member] | Later Than One Month And Not Later Than Three Months [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 188,147 244,543
Performance Guarantees [Member] | More Than 3 Months To 1 Year [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 905,554 835,030
Performance Guarantees [Member] | Between 1 and 5 Years [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 163,506 208,479
Performance Guarantees [Member] | Due After 5 Years [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 33,356 21,231
Foreign Letters Of Credit Confirmed [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 57,038 75,499
Foreign Letters Of Credit Confirmed [Member] | Not Later Than One Month [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 3,842 16,681
Foreign Letters Of Credit Confirmed [Member] | Later Than One Month And Not Later Than Three Months [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 9,128 33,513
Foreign Letters Of Credit Confirmed [Member] | More Than 3 Months To 1 Year [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 33,177 21,277
Foreign Letters Of Credit Confirmed [Member] | Between 1 and 5 Years [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 10,891 4,028
Foreign Letters Of Credit Confirmed [Member] | Due After 5 Years [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities
Letters Of Credit Issued [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 223,420 201,699
Letters Of Credit Issued [Member] | Not Later Than One Month [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 12,469 12,367
Letters Of Credit Issued [Member] | Later Than One Month And Not Later Than Three Months [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 110,970 115,720
Letters Of Credit Issued [Member] | More Than 3 Months To 1 Year [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 54,015 43,029
Letters Of Credit Issued [Member] | Between 1 and 5 Years [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 45,937 30,554
Letters Of Credit Issued [Member] | Due After 5 Years [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 29 29
Pledges And Other Commercial Commitments [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 133,623 81,578
Pledges And Other Commercial Commitments [Member] | Not Later Than One Month [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 22,128 16,028
Pledges And Other Commercial Commitments [Member] | Later Than One Month And Not Later Than Three Months [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 63,230 13,382
Pledges And Other Commercial Commitments [Member] | More Than 3 Months To 1 Year [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 41,637 47,288
Pledges And Other Commercial Commitments [Member] | Between 1 and 5 Years [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 6,628 4,880
Pledges And Other Commercial Commitments [Member] | Due After 5 Years [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities