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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 (Swaps) - CLP ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Cash flow in CLF |  |
Cash flows of the underlying asses portfolio |  |
Cash inflows | $ 1,313,683 | $ 1,352,797
Up to 1 month | Cash flow in CLF |  |
Cash flows of the underlying asses portfolio |  |
Cash inflows |  | 1,155
Between 1 and 3 months | Cash flow in CLF |  |
Cash flows of the underlying asses portfolio |  |
Cash inflows | 2,344 | 2,304
Between 3 and 12 months | Cash flow in CLF |  |
Cash flows of the underlying asses portfolio |  |
Cash inflows | 281,377 | 232,833
Due after 1 years but within 3 years | Cash flow in CLF |  |
Cash flows of the underlying asses portfolio |  |
Cash inflows | 414,764 | 592,204
Due after 3 years but within 5 years | Cash flow in CLF |  |
Cash flows of the underlying asses portfolio |  |
Cash inflows | 59,737 | 54,094
Due after 5 years | Cash flow in CLF |  |
Cash flows of the underlying asses portfolio |  |
Cash inflows | 555,461 | 470,207
Cross Currency Swap HKD |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (377,023) | (379,944)
Cross Currency Swap HKD | Between 3 and 12 months |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (9,404) | (9,253)
Cross Currency Swap HKD | Due after 1 years but within 3 years |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (66,188) | (66,278)
Cross Currency Swap HKD | Due after 3 years but within 5 years |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (16,365) | (16,091)
Cross Currency Swap HKD | Due after 5 years |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (285,066) | (288,322)
Cross Currency Swap PEN |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows |  | (16,588)
Cross Currency Swap PEN | Between 3 and 12 months |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows |  | (16,588)
Cross Currency Swap JPY |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (202,989) | (118,656)
Cross Currency Swap JPY | Between 1 and 3 months |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (1,061) | (1,043)
Cross Currency Swap JPY | Between 3 and 12 months |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (3,372) | (1,867)
Cross Currency Swap JPY | Due after 1 years but within 3 years |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (85,598) | (52,107)
Cross Currency Swap JPY | Due after 3 years but within 5 years |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (35,063) | (32,878)
Cross Currency Swap JPY | Due after 5 years |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (77,895) | (30,761)
Cross Currency Swap USD |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (155,917) | (222,900)
Cross Currency Swap USD | Between 3 and 12 months |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (111,077) | (114,210)
Cross Currency Swap USD | Due after 1 years but within 3 years |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (44,840) | (108,690)
Cross Currency Swap CHF |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (484,333) | (568,489)
Cross Currency Swap CHF | Up to 1 month |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows |  | (1,155)
Cross Currency Swap CHF | Between 1 and 3 months |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (1,283) | (1,261)
Cross Currency Swap CHF | Between 3 and 12 months |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (155,767) | (89,876)
Cross Currency Swap CHF | Due after 1 years but within 3 years |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (214,620) | (363,045)
Cross Currency Swap CHF | Due after 3 years but within 5 years |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (4,793) | (3,560)
Cross Currency Swap CHF | Due after 5 years |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (107,870) | (109,592)
Cross Currency Swap EUR |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (93,421) | (46,220)
Cross Currency Swap EUR | Between 3 and 12 months |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (1,757) | (1,039)
Cross Currency Swap EUR | Due after 1 years but within 3 years |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (3,518) | (2,084)
Cross Currency Swap EUR | Due after 3 years but within 5 years |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | (3,516) | (1,565)
Cross Currency Swap EUR | Due after 5 years |  |
Cash flows of the underlying asses portfolio |  |
Cash outflows | $ (84,630) | $ (41,532)

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