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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details Narrative) $ in Millions |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Apr. 21, 2016 CLP ($) | Dec. 31, 2018 CLP ($) Segment | Dec. 31, 2017 Segment | Dec. 31, 2016 | Sep. 30, 2016
Disclosure of associates [line items] |  |  |  |  |
Foreign exchange rate | Segment |  | 697.76 | 616.85 |  |
Foreign exchange inflation rate |  | 2.60% | 2.30% |  |
Credit valuation adjustment |  | $ 8,142 |  |  |
Debit valuation adjustment |  | $ 15,406 |  |  |
Minimum mandatory dividends distributed |  | 30.00% | 30.00% |  |
USD [Member] |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |
Foreign exchange rate | Segment |  | 1 | 1 |  |
Unidad De Fomento (funds code) [Member] |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |
Foreign exchange rate | Segment |  | 27,565.79 | 26,798.14 |  |
Sociedad Operadora de la Camara de Compensacion de pagos de Alto Valor S.A. [Member] |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |
Increase (decrease) in bank shares percenatge |  |  | 15.00% | 14.84% | 14.93%
Servicios de Infraestructura de Mercado OTC S.A. [Member] |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |
Increase (decrease) in bank shares percenatge |  |  |  | 11.93% | 12.07%
Transbank S.A. [Member] |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |
Proportion of ownership interest in subsidiary | 25.00% |  |  |  |
Payments of shares | $ 4,000 |  |  |  |
Subscribed and paid shares | $ 1,000 |  |  |  |
Banco Santander Spain [Member] | Banco Santander-Chile [Member] |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |
Proportion of ownership interest in subsidiary |  | 99.50% |  |  |
Banco Santander Spain [Member] | Teatinos Siglo XXi inversiones Ltda [Member] |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |
Proportion of ownership interest in subsidiary |  | 100.00% |  |  |
Banco Santander Spain [Member] | Santander-Chile Bank [Member] |  |  |  |  |
Disclosure of associates [line items] |  |  |  |  |
Proportion of ownership interest in subsidiary |  | 67.18% |  |  |

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