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Financial risk management (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure Of Financial Risk Management Explanatory [Abstract] |
Disclosure of credit risk exposure [text block] | The credit quality of financial assets that are not past due or impaired can be evaluated by reference to external credit ratings (if available) or historical information on counterparty late payment rates:
Financial institution |  | Financial assets |  |  | Rating Institution |  |  | 12/31/2018 |
|  |  |  |  | Moody´s |  |  | S&P |  |  | Fitch |  |  | ThUS$ |
Banco de Chile |  | Time deposits |  |  | P-1 |  |  | A-1 |  |  |  | - |  |  |  | 7,305 |
Banco de Crédito e Inversiones |  | Time deposits |  |  | P-1 |  |  | A-1 |  |  |  |  |  |  |  | 27,428 |
Banco Itau Corpbanca |  | Time deposits |  |  | P-2 |  |  | A-2 |  |  |  |  |  |  |  | 61,946 |
Banco Santander |  | Time deposits |  |  | - |  |  | - |  |  |  |  |  |  |  | 432 |
Banco Estado |  | Time deposits |  |  | - |  |  | - |  |  |  |  |  |  |  | 3,602 |
BBVA Banco Francés |  | Time deposits |  |  | - |  |  | - |  |  |  | - |  |  |  | 84 |
Nedbank |  | Time deposits |  |  | P-3 |  |  | B |  |  |  | - |  |  |  | 647 |
JP Morgan US dollar Liquidity Fund Institutional |  | Investment fund deposits |  |  | - |  |  | - |  |  |  | - |  |  |  | 133,809 |
Legg Mason - Western Asset Institutional Cash Reserves |  | Investment fund deposits |  |  | - |  |  | - |  |  |  | - |  |  |  | 132,108 |
Total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 367,361 |
Financial institution |  | Financial assets |  |  | Rating Institution |  |  | 12/31/2018 |
|  |  |  |  | Moody´s |  |  | S&P |  |  | Fitch |  |  | ThUS$ |
Banco Sud Americano |  | 90 days to 1 year |  |  | - |  |  | - |  |  |  | - |  |  |  | 24,898 |
Banco de Crédito e Inversiones |  | 90 days to 1 year |  |  | P-1 |  |  | A-1 |  |  |  | - |  |  |  | 145,834 |
Banco Santander |  | 90 days to 1 year |  |  | P-1 |  |  | A-1 |  |  |  | - |  |  |  | 23,124 |
Banco Itaú-Corpbanca |  | 90 days to 1 year |  |  | P-2 |  |  | A-2 |  |  |  | - |  |  |  | 70,719 |
Banco Security |  | 90 days to 1 year |  |  | - |  |  | - |  |  |  | - |  |  |  | 27,215 |
Total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 291,790 |
The following table presents comparative information as of December 2017:
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 de 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 |  |  |  |  |  |  |  |  |  | - |  |  |  | - |  |  |  |  |
Reserves |  | Investment fund deposits |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 144.464 |
Scotiabank Sud Americano |  | Time deposit |  |  |  |  |  |  |  | - |  |  |  | - |  |  |  | 12,520 |
Nedank |  | Time deposit |  |  |  | P-3 |  |  |  | B |  |  |  | - |  |  |  | 3,686 |
ABN Amro Bank |  | Time deposit |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 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 de 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 |
Banco Itaú-Corpbanca |  | 90 days to 1 year |  |  |  | P-1 |  |  |  | A-2 |  |  |  | - |  |  |  | 77,526 |
Banco Santander - Santiago |  | 90 days to 1 year |  |  |  | P-1 |  |  |  | A-1 |  |  |  | F1 |  |  |  | 163,269 |
Morgan Stanley |  | 90 days to 1 year |  |  |  | P-2 |  |  |  | A-2 |  |  |  | F1 |  |  |  | 4,191 |
Banco Security |  | 90 days to 1 year |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 28,592 |
Scotiabank Sud Americano |  | 90 days to 1 year |  |  |  | - |  |  |  | - |  |  |  | AA |  |  |  | 13,765 |
Total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 365,132 |
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, 2018 |  | Carrying amount |  |  | Less than 1 year |  |  | 1 to 5 years |  |  | Over 5 years |  |  | Total |
(in millions of US$) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other non-derivative financial liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bank borrowings |  |  | 70.25 |  |  |  | 4.10 |  |  |  | 79.66 |  |  |  | - |  |  |  | 83.76 |
Unsecured obligations |  |  | 1,273.07 |  |  |  | 61.37 |  |  |  | 823.76 |  |  |  | 713.60 |  |  |  | 1,598.73 |
Subtotal |  |  | 1,343.32 |  |  |  | 65.47 |  |  |  | 903.42 |  |  |  | 713.60 |  |  |  | 1,682.49 |
Other derivative financial liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Hedging liabilities |  |  | (14.34 | ) |  |  | 5.52 |  |  |  | 15.64 |  |  |  | 29.27 |  |  |  | 50.43 |
Derivative financial instruments |  |  | 0.16 |  |  |  | 0.16 |  |  |  | - |  |  |  | - |  |  |  | 0.16 |
Subtotal |  |  | (14.18 | ) |  |  | 5.68 |  |  |  | 15.64 |  |  |  | 29.27 |  |  |  | 50.59 |
Trade accounts payable and other accounts payable |  |  | 163.75 |  |  |  | 163.17 |  |  |  | 0.58 |  |  |  | - |  |  |  | - |
Total |  |  | 1,492.89 |  |  |  | 234.32 |  |  |  | 919.64 |  |  |  | 742.87 |  |  |  | 1,733.08 |
|  | Nature of undiscounted cash flows |
As of December 31, 2017 |  | Carrying amount |  |  | Less than 1 year |  |  | 1 to 5 years |  |  | Over 5 years |  |  | Total |
(in millions of US$) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |
Trade accounts payable and other accounts payable |  |  | 196,28 |  |  |  | 196.18 |  |  |  | 0.10 |  |  |  | - |  |  |  | - |
Total |  |  | 1,247.64 |  |  |  | 446.22 |  |  |  | 513.11 |  |  |  | 733.31 |  |  |  | 1,496.36 |

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