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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 hedge - CLP ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Cash flow in CLF |  |
Cash flows of the underlying asses portfolio |  |
Cash inflows | $ 1,293,174 | $ 1,313,683
Between 1 and 3 months | Cash flow in CLF |  |
Cash flows of the underlying asses portfolio |  |
Cash inflows | 144,458 | 2,344
Between 3 and 12 months | Cash flow in CLF |  |
Cash flows of the underlying asses portfolio |  |
Cash inflows | 237,340 | 281,377
Due after 1 years but within 3 years | Cash flow in CLF |  |
Cash flows of the underlying asses portfolio |  |
Cash inflows | 173,263 | 414,764
Due after 3 years but within 5 years | Cash flow in CLF |  |
Cash flows of the underlying asses portfolio |  |
Cash inflows | 195,590 | 59,737
Due after 5 years | Cash flow in CLF |  |
Cash flows of the underlying asses portfolio |  |
Cash inflows | 542,523 | 555,461
Cross Currency Swap HKD |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (378,150) | (377,023)
Cross Currency Swap HKD | Between 3 and 12 months |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (59,667) | (9,404)
Cross Currency Swap HKD | Due after 1 years but within 3 years |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (16,835) | (66,188)
Cross Currency Swap HKD | Due after 3 years but within 5 years |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (68,362) | (16,365)
Cross Currency Swap HKD | Due after 5 years |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (233,286) | (285,066)
Cross Currency Swap JPY |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (204,243) | (202,989)
Cross Currency Swap JPY | Between 1 and 3 months |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (50,247) | (1,061)
Cross Currency Swap JPY | Between 3 and 12 months |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (2,740) | (3,372)
Cross Currency Swap JPY | Due after 1 years but within 3 years |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (37,432) | (85,598)
Cross Currency Swap JPY | Due after 3 years but within 5 years |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (35,213) | (35,063)
Cross Currency Swap JPY | Due after 5 years |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (78,611) | (77,895)
Cross Currency Swap USD |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (193,821) | (155,917)
Cross Currency Swap USD | Between 3 and 12 months |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (47,797) | (111,077)
Cross Currency Swap USD | Due after 1 years but within 3 years |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (107,893) | (44,840)
Cross Currency Swap USD | Due after 3 years but within 5 years |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (1,243) |
Cross Currency Swap USD | Due after 5 years |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (36,888) |
Cross Currency Swap CHF |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (422,670) | (484,333)
Cross Currency Swap CHF | Between 1 and 3 months |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (94,211) | (1,283)
Cross Currency Swap CHF | Between 3 and 12 months |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (125,325) | (155,767)
Cross Currency Swap CHF | Due after 1 years but within 3 years |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (7,482) | (214,620)
Cross Currency Swap CHF | Due after 3 years but within 5 years |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (87,164) | (4,793)
Cross Currency Swap CHF | Due after 5 years |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (108,488) | (107,870)
Cross Currency Swap EUR |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (94,290) | (93,421)
Cross Currency Swap EUR | Between 3 and 12 months |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (1,811) | (1,757)
Cross Currency Swap EUR | Due after 1 years but within 3 years |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (3,621) | (3,518)
Cross Currency Swap EUR | Due after 3 years but within 5 years |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (3,608) | (3,516)
Cross Currency Swap EUR | Due after 5 years |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | $ (85,250) | $ (84,630)

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