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Derivative Instruments and Accounting Hedges - Cash flows of the underlying assets portfolio and the cash flow of the liability part of the derivatives (Details) - Cash Flow Hedges - CLP ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Net cash flows |  |
Cross Currency Swap CHF |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (208,618) | $ (422,670)
Cross Currency Swap EUR |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (94,976) | (94,290)
Cross Currency Swap HKD |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (363,929) | (378,150)
Cross Currency Swap JPY |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (284,212) | (204,243)
Cross Currency Swap USD |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (201,739) | (193,821)
Cross Currency Swap PEN |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (31,695) |
Cross Currency Swap Aud |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (111,381) |
Cross Currency Swap Nok |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (67,523) |
Over 3 years and up to 5 years |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Net cash flows |  |
Over 3 years and up to 5 years | Cross Currency Swap CHF |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (197,107) | (87,164)
Over 3 years and up to 5 years | Cross Currency Swap EUR |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (3,718) | (3,608)
Over 3 years and up to 5 years | Cross Currency Swap HKD |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (69,035) | (68,362)
Over 3 years and up to 5 years | Cross Currency Swap JPY |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (6,424) | (35,213)
Over 3 years and up to 5 years | Cross Currency Swap USD |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (1,281) | (1,243)
Over 3 years and up to 5 years | Cross Currency Swap PEN |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (189) |
Over 3 years and up to 5 years | Cross Currency Swap Aud |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (1,104) |
Over 3 years and up to 5 years | Cross Currency Swap Nok |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (1,216) |
Over 3 months and up to 12 months [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Net cash flows |  |
Over 3 months and up to 12 months [Member] | Cross Currency Swap CHF |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (3,858) | (125,325)
Over 3 months and up to 12 months [Member] | Cross Currency Swap EUR |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (1,857) | (1,811)
Over 3 months and up to 12 months [Member] | Cross Currency Swap HKD |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (8,798) | (59,667)
Over 3 months and up to 12 months [Member] | Cross Currency Swap JPY |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (4,096) | (2,740)
Over 3 months and up to 12 months [Member] | Cross Currency Swap USD |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (1,275) | (47,797)
Over 3 months and up to 12 months [Member] | Cross Currency Swap PEN |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (48) |
Over 3 months and up to 12 months [Member] | Cross Currency Swap Aud |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (521) |
Over 3 months and up to 12 months [Member] | Cross Currency Swap Nok |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (609) |
Over 1 year and up to 3 years |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Net cash flows |  |
Over 1 year and up to 3 years | Cross Currency Swap CHF |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (7,653) | (7,482)
Over 1 year and up to 3 years | Cross Currency Swap EUR |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (3,715) | (3,621)
Over 1 year and up to 3 years | Cross Currency Swap HKD |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (17,906) | (16,835)
Over 1 year and up to 3 years | Cross Currency Swap JPY |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (40,344) | (37,432)
Over 1 year and up to 3 years | Cross Currency Swap USD |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (161,941) | (107,893)
Over 1 year and up to 3 years | Cross Currency Swap PEN |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (188) |
Over 1 year and up to 3 years | Cross Currency Swap Aud |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (1,103) |
Over 1 year and up to 3 years | Cross Currency Swap Nok |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (1,215) |
Over 1 months and up to 3 months |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Net cash flows |  |
Over 1 months and up to 3 months | Cross Currency Swap CHF |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows |  | (94,211)
Over 1 months and up to 3 months | Cross Currency Swap EUR |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows |  |
Over 1 months and up to 3 months | Cross Currency Swap HKD |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows |  |
Over 1 months and up to 3 months | Cross Currency Swap JPY |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (33,570) | (50,247)
Over 1 months and up to 3 months | Cross Currency Swap USD |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows |  |
Over 1 months and up to 3 months | Cross Currency Swap PEN |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (47) |
Over 1 months and up to 3 months | Cross Currency Swap Aud |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (31) |
Over 1 months and up to 3 months | Cross Currency Swap Nok |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows |  |
Over 5 years |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Net cash flows |  |
Over 5 years | Cross Currency Swap CHF |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows |  | (108,488)
Over 5 years | Cross Currency Swap EUR |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (85,686) | (85,250)
Over 5 years | Cross Currency Swap HKD |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (268,034) | (233,286)
Over 5 years | Cross Currency Swap JPY |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (199,778) | (78,611)
Over 5 years | Cross Currency Swap USD |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (37,242) | (36,888)
Over 5 years | Cross Currency Swap PEN |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (31,223) |
Over 5 years | Cross Currency Swap Aud |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (108,622) |
Over 5 years | Cross Currency Swap Nok |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (64,483) |
Up to 1 month |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Net cash flows |  |
Up to 1 month | Cross Currency Swap CHF |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows |  |
Up to 1 month | Cross Currency Swap EUR |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows |  |
Up to 1 month | Cross Currency Swap HKD |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows | (156) |
Up to 1 month | Cross Currency Swap JPY |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows |  |
Up to 1 month | Cross Currency Swap USD |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows |  |
Up to 1 month | Cross Currency Swap PEN |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows |  |
Up to 1 month | Cross Currency Swap Aud |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows |  |
Up to 1 month | Cross Currency Swap Nok |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash outflows |  |
Cash flow in CLF |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash inflows | 1,364,073 | 1,293,174
Cash flow in CLF | Over 3 years and up to 5 years |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash inflows | 280,074 | 195,590
Cash flow in CLF | Over 3 months and up to 12 months [Member] |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash inflows | 21,062 | 237,340
Cash flow in CLF | Over 1 year and up to 3 years |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash inflows | 234,065 | 173,263
Cash flow in CLF | Over 1 months and up to 3 months |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash inflows | 33,648 | 144,458
Cash flow in CLF | Over 5 years |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash inflows | 795,068 | $ 542,523
Cash flow in CLF | Up to 1 month |  |
Disclosure of maturity analysis for derivative financial liabilities [line items] |  |
Cash inflows | $ 156 |

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