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Financial risk management (Tables) | 12 Months Ended
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Dec. 31, 2017
Disclosure Of Financial Risk Management Explanatory [Abstract] |
Disclosure of credit risk exposure [text block] | The credit quality of financial assets that are neither past due nor impaired can be assessed by reference to external credit ratings (if available) or to historical information about counterparty default rates:
Financial institution |  | Financial assets |  | Rating Institution |  | 12/31/2017 |
|  |  |  | Moody´s |  | S&;P |  | Fitch |  | ThUS$ |
Banco BBVA Chile |  | Time deposits |  | P-2 |  | A-2 |  | - |  | 41,860 |
Banco Crédito e Inversiones |  | Time deposits |  | P-1 |  | A-1- |  | F1 |  | 120,616 |
Banco Santander - Santiago |  | Time deposits |  | P-1 |  | A-1 |  | F1 |  | 35,558 |
BBVA Banco Francés |  | Time deposits |  | - |  | - |  | - |  | 163 |
Itau-Corpbanca |  | Time deposits |  | P-2 |  | A-2 |  | - |  | 75,072 |
JP Morgan US dollar Liquidity Fund Institutional |  | Investment fund deposits |  | - |  | - |  | - |  | 143,333 |
Legg Mason - Western Asset Institutional Cash Reserves |  | Investment fund deposits |  | - |  | - |  | - |  | 144,464 |
Scotiabank Sud Americano |  | Time deposits |  | - |  | - |  | - |  | 12,520 |
Nedbank |  | Time deposits |  | P-3 |  | B |  | - |  | 3,686 |
ABN Armo Bank |  | Time deposits |  | - |  |  |  |  |  | 1,439 |
Total |  |  |  |  |  |  |  |  |  | 578,711 |
Financial institution |  | Financial assets |  | Rating Institution |  | 12/31/2017 |
|  |  |  | Moody´s |  | S&;P |  | Fitch |  | ThUS$ |
Banco BBVA Chile |  | 90 days to 1 year |  | - |  | - |  | - |  | 1,207 |
Banco Crédito e Inversiones |  | 90 days to 1 year |  | P-1 |  | A-1 |  | F1 |  | 71,748 |
Banco de Chile |  | 90 days to 1 year |  | - |  | - |  | - |  | 4,834 |
Itau-Corpbanca |  | 90 days to 1 year |  | P-1 |  | A-2 |  | - |  | 77,527 |
Banco Santander - Santiago |  | 90 days to 1 year |  | P-1 |  | A-1 |  | F1 |  | 163,269 |
Banco Security |  | 90 days to 1 year |  | - |  | - |  | - |  | 28,592 |
Scotiabank Sud Americano |  | 90 days to 1 year |  | - |  | - |  | AA |  | 13,764 |
Total |  |  |  |  |  |  |  |  |  | 360,941 |
Disclosure of cash and cash equivalents of cashflows [Text Block] | The position in other cash and cash equivalents generated by the Company are invested in highly liquid mutual funds with an AAA risk rating.
|  | Nature of undiscounted cash flows |
As of December 31, 2017 |  | Carrying amount |  | Less than 1 year |  | 1 to 5 years |  | Over 5 years |  | Total |
(in millions of US$) |  |  |  |  |  |  |  |  |  |  |
Other non-derivative financial liabilities |  |  |  |  |  |  |  |  |  |  |
Bank borrowings |  | 163.57 |  | 164.78 |  | - |  | - |  | 164.78 |
Unsecured obligations |  | 1,054.89 |  | 47.45 |  | 522.52 |  | 751.67 |  | 1,321.64 |
Subtotal |  | 1,218.46 |  | 212.23 |  | 522.52 |  | 751.67 |  | 1,486.42 |
Other derivative financial liabilities |  |  |  |  |  |  |  |  |  |  |
Hedging liabilities |  | 28.38 |  | 37.01 |  | (9.51) |  | (18.36) |  | 9.14 |
Derivative financial instruments |  | 0.80 |  | 0.80 |  | - |  | - |  | 0.80 |
Subtotal |  | 29.18 |  | 37.81 |  | (9.51) |  | (18.36) |  | 9.94 |
Total |  | 1,247.64 |  | 250.04 |  | 513.01 |  | 733.31 |  | 1,496.36 |
|  | Nature of undiscounted cash flows |
As of December 31, 2016 |  | Carrying amount |  | Less than 1 |  | 1 to 5 years |  | Over 5 years |  | Total |
(in millions of US$) |  |  |  |  |  |  |  |  |  |  |
Other non-derivative financial liabilities |  |  |  |  |  |  |  |  |  |  |
Bank borrowings |  | 101.27 |  | 102.08 |  | - |  | - |  | 102.08 |
Unsecured obligations |  | 1,130.22 |  | 94.76 |  | 479.54 |  | 873.91 |  | 1,448.21 |
Subtotal |  | 1,231.49 |  | 196.84 |  | 479.54 |  | 873.91 |  | 1,550.29 |
Other derivative financial liabilities |  |  |  |  |  |  |  |  |  |  |
Hedging liabilities |  | 42.62 |  | 17.20 |  | 40.33 |  | (23.58) |  | 33.95 |
Derivative financial instruments |  | (2.175) |  | (2.18) |  | - |  | - |  | (2.18) |
Subtotal |  | 40.445 |  | 15.02 |  | 40.33 |  | (23.58) |  | 31.77 |
Total |  | 1,271.94 |  | 211.86 |  | 519.87 |  | 850.33 |  | 1,582.06 |

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- Definition The disclosure of the credit risk exposure. Credit risk exposure is the credit risk inherent in an entity’s financial assets and commitments to extend credit. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35M&doctype=Standard -URIDate 2017-03-09 + Details
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