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NON-CONTROLLING INTEREST (Details 1) - CLP ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of subsidiaries [line items]      
Assets $ 258,617 $ 246,559 $ 256,316
Liabilities 71,272 76,475 90,663
Capital 170,296 142,079 147,601
Net income 17,049 28,005 18,052
Santander Corredora de Seguros Limitada [Member]      
Disclosure of subsidiaries [line items]      
Assets 77,764 76,177 75,000
Liabilities 9,595 9,803 10,065
Capital 66,374 64,937 62,276
Net income 1,795 1,437 2,659
Santander Corredores de Bolsa Limitada [Member]      
Disclosure of subsidiaries [line items]      
Assets 102,228 88,711 86,473
Liabilities 57,999 45,855 45,724
Capital 42,691 41,424 38,356
Net income 1,538 1,432 2,393
Santander Agente de Valores Limitada [Member]      
Disclosure of subsidiaries [line items]      
Assets 50,552 44,910 54,486
Liabilities 71 4,732 3,666
Capital 40,177 26,569 38,851
Net income 10,304 13,609 11,969
Santander S.A. Sociedad Securitizadora [Member]      
Disclosure of subsidiaries [line items]      
Assets 704 400 509
Liabilities 66 50 77
Capital 728 432 512
Net income (90) (82) (80)
Santander Gestion de Recaudacion y Cobranzas Limitada [Member]      
Disclosure of subsidiaries [line items]      
Assets 6,932 10,826 8,547
Liabilities 3,155 7,901 6,363
Capital 2,925 2,184 1,602
Net income 852 741 582
Bansa Santander S.A. [Member]      
Disclosure of subsidiaries [line items]      
Assets 20,437 25,535 31,301
Liabilities 386 8,134 24,768
Capital 17,401 6,533 6,004
Net income $ 2,650 $ 10,868 $ 529