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Derivative Instruments and Accounting Hedges - Cash flows of bonds issued abroad, the objects of these hedges and the cash flows of the asset part of the derivative (Details) - Cash Flow Hedges - CLP ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Net cash flows |  |
Cross Currency Swap CHF |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 209,255 | $ 405,301
Cross Currency Swap EUR |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 98,194 | 93,785
Cross Currency Swap HKD |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 450,094 | 434,793
Cross Currency Swap JPY |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 272,462 | 188,633
Cross Currency Swap USD |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 51,994 | 49,440
Cross Currency Swap USD |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 168,028 | 155,979
Cross Currency Swap PEN |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 58,589 |
Cross Currency Swap Aud |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 175,001 |
Cross Currency Swap Nok |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 87,624 |
Up to 1 month |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Net cash flows |  |
Up to 1 month | Cross Currency Swap CHF |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows |  |
Up to 1 month | Cross Currency Swap EUR |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows |  |
Up to 1 month | Cross Currency Swap HKD |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows |  |
Up to 1 month | Cross Currency Swap JPY |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows |  |
Up to 1 month | Cross Currency Swap USD |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows |  |
Up to 1 month | Cross Currency Swap USD |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 216 | 870
Up to 1 month | Cross Currency Swap PEN |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows |  |
Up to 1 month | Cross Currency Swap Aud |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows |  |
Up to 1 month | Cross Currency Swap Nok |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows |  |
Over 1 month and up to 3 months |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Net cash flows |  |
Over 1 month and up to 3 months | Cross Currency Swap CHF |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows |  | 89,256
Over 1 month and up to 3 months | Cross Currency Swap EUR |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows |  |
Over 1 month and up to 3 months | Cross Currency Swap HKD |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows |  |
Over 1 month and up to 3 months | Cross Currency Swap JPY |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 34,638 | 49,362
Over 1 month and up to 3 months | Cross Currency Swap USD |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows |  |
Over 1 month and up to 3 months | Cross Currency Swap USD |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 336 | 86
Over 1 month and up to 3 months | Cross Currency Swap PEN |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 894 |
Over 1 month and up to 3 months | Cross Currency Swap Aud |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 428 |
Over 1 month and up to 3 months | Cross Currency Swap Nok |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows |  |
Over 3 months and up to 12 months |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Net cash flows |  |
Over 3 months and up to 12 months | Cross Currency Swap CHF |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 798 | 125,993
Over 3 months and up to 12 months | Cross Currency Swap EUR |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 1,421 | 1,338
Over 3 months and up to 12 months | Cross Currency Swap HKD |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 12,829 | 66,378
Over 3 months and up to 12 months | Cross Currency Swap JPY |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 2,121 | 1,072
Over 3 months and up to 12 months | Cross Currency Swap USD |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 1,600 | 1,476
Over 3 months and up to 12 months | Cross Currency Swap USD |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 884 | 49,401
Over 3 months and up to 12 months | Cross Currency Swap PEN |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 894 |
Over 3 months and up to 12 months | Cross Currency Swap Aud |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 3,274 |
Over 3 months and up to 12 months | Cross Currency Swap Nok |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 2,341 |
Over 1 year and up to 3 years |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Net cash flows |  |
Over 1 year and up to 3 years | Cross Currency Swap CHF |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 1,597 | 1,450
Over 1 year and up to 3 years | Cross Currency Swap EUR |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 2,842 | 2,675
Over 1 year and up to 3 years | Cross Currency Swap HKD |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 25,627 | 21,601
Over 1 year and up to 3 years | Cross Currency Swap JPY |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 38,596 | 33,487
Over 1 year and up to 3 years | Cross Currency Swap USD |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 3,200 | 2,952
Over 1 year and up to 3 years | Cross Currency Swap USD |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 166,592 | 105,622
Over 1 year and up to 3 years | Cross Currency Swap PEN |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 3,575 |
Over 1 year and up to 3 years | Cross Currency Swap Aud |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 7,399 |
Over 1 year and up to 3 years | Cross Currency Swap Nok |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 4,682 |
Over 3 year and up to 5 years |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Net cash flows |  |
Over 3 year and up to 5 years | Cross Currency Swap CHF |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 90,095 | 82,552
Over 3 year and up to 5 years | Cross Currency Swap EUR |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 2,842 | 2,675
Over 3 year and up to 5 years | Cross Currency Swap HKD |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 91,034 | 83,608
Over 3 year and up to 5 years | Cross Currency Swap JPY |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 3,482 | 32,882
Over 3 year and up to 5 years | Cross Currency Swap USD |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 3,200 | 2,952
Over 3 year and up to 5 years | Cross Currency Swap USD |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows |  |
Over 3 year and up to 5 years | Cross Currency Swap PEN |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 3,575 |
Over 3 year and up to 5 years | Cross Currency Swap Aud |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 7,401 |
Over 3 year and up to 5 years | Cross Currency Swap Nok |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 4,682 |
Over 5 years |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Net cash flows |  |
Over 5 years | Cross Currency Swap CHF |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 116,765 | 106,050
Over 5 years | Cross Currency Swap EUR |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 91,089 | 87,097
Over 5 years | Cross Currency Swap HKD |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 320,604 | 263,206
Over 5 years | Cross Currency Swap JPY |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 193,625 | 71,830
Over 5 years | Cross Currency Swap USD |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 43,994 | 42,060
Over 5 years | Cross Currency Swap USD |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows |  |
Over 5 years | Cross Currency Swap PEN |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 49,651 |
Over 5 years | Cross Currency Swap Aud |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 156,499 |
Over 5 years | Cross Currency Swap Nok |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash inflows | 75,919 |
Obligation USD |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (168,028) | (155,979)
Obligation USD | Up to 1 month |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (216) | (870)
Obligation USD | Over 1 month and up to 3 months |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (336) | (86)
Obligation USD | Over 3 months and up to 12 months |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (884) | (49,401)
Obligation USD | Over 1 year and up to 3 years |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (166,592) | (105,622)
Obligation USD | Over 3 year and up to 5 years |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow |  |
Obligation USD | Over 5 years |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow |  |
Corporate Bond USD |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (51,994) | (49,440)
Corporate Bond USD | Up to 1 month |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow |  |
Corporate Bond USD | Over 1 month and up to 3 months |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow |  |
Corporate Bond USD | Over 3 months and up to 12 months |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (1,600) | (1,476)
Corporate Bond USD | Over 1 year and up to 3 years |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (3,200) | (2,952)
Corporate Bond USD | Over 3 year and up to 5 years |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (3,200) | (2,952)
Corporate Bond USD | Over 5 years |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (43,994) | (42,060)
Corporate Bond JPY |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (272,462) | (188,633)
Corporate Bond JPY | Up to 1 month |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow |  |
Corporate Bond JPY | Over 1 month and up to 3 months |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (34,638) | (49,362)
Corporate Bond JPY | Over 3 months and up to 12 months |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (2,121) | (1,072)
Corporate Bond JPY | Over 1 year and up to 3 years |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (38,596) | (33,487)
Corporate Bond JPY | Over 3 year and up to 5 years |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (3,482) | (32,882)
Corporate Bond JPY | Over 5 years |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (193,625) | (71,830)
Corporate Bond HKD |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (450,094) | (434,793)
Corporate Bond HKD | Up to 1 month |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow |  |
Corporate Bond HKD | Over 1 month and up to 3 months |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow |  |
Corporate Bond HKD | Over 3 months and up to 12 months |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (12,829) | (66,378)
Corporate Bond HKD | Over 1 year and up to 3 years |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (25,627) | (21,601)
Corporate Bond HKD | Over 3 year and up to 5 years |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (91,034) | (83,608)
Corporate Bond HKD | Over 5 years |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (320,604) | (263,206)
Corporate Bond EUR |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (98,194) | (93,785)
Corporate Bond EUR | Up to 1 month |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow |  |
Corporate Bond EUR | Over 1 month and up to 3 months |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow |  |
Corporate Bond EUR | Over 3 months and up to 12 months |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (1,421) | (1,338)
Corporate Bond EUR | Over 1 year and up to 3 years |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (2,842) | (2,675)
Corporate Bond EUR | Over 3 year and up to 5 years |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (2,842) | (2,675)
Corporate Bond EUR | Over 5 years |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (91,089) | (87,097)
Corporate Bond CHF |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (209,255) | (405,301)
Corporate Bond CHF | Up to 1 month |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow |  |
Corporate Bond CHF | Over 1 month and up to 3 months |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow |  | (89,256)
Corporate Bond CHF | Over 3 months and up to 12 months |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (798) | (125,993)
Corporate Bond CHF | Over 1 year and up to 3 years |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (1,597) | (1,450)
Corporate Bond CHF | Over 3 year and up to 5 years |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (90,095) | (82,552)
Corporate Bond CHF | Over 5 years |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (116,765) | $ (106,050)
Corporate Bond PEN |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (58,589) |
Corporate Bond PEN | Up to 1 month |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow |  |
Corporate Bond PEN | Over 1 month and up to 3 months |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (894) |
Corporate Bond PEN | Over 3 months and up to 12 months |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (894) |
Corporate Bond PEN | Over 1 year and up to 3 years |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (3,575) |
Corporate Bond PEN | Over 3 year and up to 5 years |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (3,575) |
Corporate Bond PEN | Over 5 years |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (49,651) |
Corporate Bond AUD |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (175,001) |
Corporate Bond AUD | Up to 1 month |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow |  |
Corporate Bond AUD | Over 1 month and up to 3 months |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (428) |
Corporate Bond AUD | Over 3 months and up to 12 months |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (3,274) |
Corporate Bond AUD | Over 1 year and up to 3 years |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (7,399) |
Corporate Bond AUD | Over 3 year and up to 5 years |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (7,401) |
Corporate Bond AUD | Over 5 years |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (156,499) |
Corporate Bond NOK |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (87,624) |
Corporate Bond NOK | Up to 1 month |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow |  |
Corporate Bond NOK | Over 1 month and up to 3 months |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow |  |
Corporate Bond NOK | Over 3 months and up to 12 months |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (2,341) |
Corporate Bond NOK | Over 1 year and up to 3 years |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (4,682) |
Corporate Bond NOK | Over 3 year and up to 5 years |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | (4,682) |
Corporate Bond NOK | Over 5 years |  |
Disclosure of maturity analysis for financial assets held for managing liquidity risk [line items] |  |
Cash outflow | $ (75,919) |

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