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Risk Management (Details 15) - Liquidity Risk [Member] - CLP ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Issue debt instruments [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities $ 9,500,723 $ 8,115,233
Issue debt instruments [Member] | Not Later Than One Month [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 285,159 71,465
Issue debt instruments [Member] | Later Than One Month And Not Later Than Three Months [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 759,519 39,267
Issue debt instruments [Member] | More Than 3 Months To 1 Year [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 1,044,674 745,830
Issue debt instruments [Member] | Due After 5 Years [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 2,974,229 3,277,079
Issue debt instruments [Member] | Later than three years and not later than five years [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 22,292 1,549,743
Other Commercial Commitments [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities   2,638,286
Other Commercial Commitments [Member] | Not Later Than One Month [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 230,767 702,081
Other Commercial Commitments [Member] | Later Than One Month And Not Later Than Three Months [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 555,535 371,475
Other Commercial Commitments [Member] | More Than 3 Months To 1 Year [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 1,262,006 1,034,383
Other Commercial Commitments [Member] | Between 1 and 5 Years [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 509,631 226,962
Other Commercial Commitments [Member] | Due After 5 Years [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 2,580,231 33,385
Other Commercial Commitments [Member] | Performance Guarantees [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 1,923,022 1,954,205
Other Commercial Commitments [Member] | Performance Guarantees [Member] | Not Later Than One Month [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 144,364 663,642
Other Commercial Commitments [Member] | Performance Guarantees [Member] | Later Than One Month And Not Later Than Three Months [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 544,370 188,147
Other Commercial Commitments [Member] | Performance Guarantees [Member] | More Than 3 Months To 1 Year [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 899,437 905,554
Other Commercial Commitments [Member] | Performance Guarantees [Member] | Between 1 and 5 Years [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 312,559 163,506
Other Commercial Commitments [Member] | Performance Guarantees [Member] | Due After 5 Years [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 22,292 33,356
Other Commercial Commitments [Member] | Confirmed Foreign Letters of Credit [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 70,192 57,038
Other Commercial Commitments [Member] | Confirmed Foreign Letters of Credit [Member] | Not Later Than One Month [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 25,491 3,842
Other Commercial Commitments [Member] | Confirmed Foreign Letters of Credit [Member] | Later Than One Month And Not Later Than Three Months [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 1,808 9,128
Other Commercial Commitments [Member] | Confirmed Foreign Letters of Credit [Member] | More Than 3 Months To 1 Year [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 11,306 33,177
Other Commercial Commitments [Member] | Confirmed Foreign Letters of Credit [Member] | Between 1 and 5 Years [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 31,587 10,891
Other Commercial Commitments [Member] | Confirmed Foreign Letters of Credit [Member] | Due After 5 Years [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities
Other Commercial Commitments [Member] | Letters Of Credit Issued [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 135,266 223,420
Other Commercial Commitments [Member] | Letters Of Credit Issued [Member] | Not Later Than One Month [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 30,555 12,469
Other Commercial Commitments [Member] | Letters Of Credit Issued [Member] | Later Than One Month And Not Later Than Three Months [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 348 110,970
Other Commercial Commitments [Member] | Letters Of Credit Issued [Member] | More Than 3 Months To 1 Year [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 33,439 54,015
Other Commercial Commitments [Member] | Letters Of Credit Issued [Member] | Between 1 and 5 Years [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 70,924 45,937
Other Commercial Commitments [Member] | Letters Of Credit Issued [Member] | Due After 5 Years [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 29
Other Commercial Commitments [Member] | Pledges And Other Commercial Commitments [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 451,751 133,623
Other Commercial Commitments [Member] | Pledges And Other Commercial Commitments [Member] | Not Later Than One Month [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 30,357 22,128
Other Commercial Commitments [Member] | 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 9,009 63,230
Other Commercial Commitments [Member] | Pledges And Other Commercial Commitments [Member] | More Than 3 Months To 1 Year [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 317,824 41,637
Other Commercial Commitments [Member] | Pledges And Other Commercial Commitments [Member] | Between 1 and 5 Years [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities 94,561 6,628
Other Commercial Commitments [Member] | Pledges And Other Commercial Commitments [Member] | Due After 5 Years [Member]    
Disclosure of financial liabilities [line items]    
Financial liabilities