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Financial risk management (Tables) | 12 Months Ended
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Dec. 31, 2019
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 |  |  | As of December ‎ 31, 2019 |
|  |  |  |  | Moody´s |  |  | S&P |  |  | Fitch |  |  | ThUS$ |
Banco de Chile |  |  | Time deposits |  |  |  | P-1 |  |  |  | A-1 |  |  |  | - |  |  |  | 50,221 |
Banco de Crédito e Inversiones |  |  | Time deposits |  |  |  | P-1 |  |  |  | A-1 |  |  |  | - |  |  |  | 42,096 |
Banco Itau Corpbanca |  |  | Time deposits |  |  |  | P-2 |  |  |  | A-2 |  |  |  | - |  |  |  | 39,093 |
Banco Santander |  |  | Time deposits |  |  |  | P-1 |  |  |  | A-1 |  |  |  | - |  |  |  | 2,708 |
Scotiabank Sud Americano |  |  | Time deposits |  |  |  | - |  |  |  | - |  |  |  | F1+ |  |  |  | 14,428 |
Banco Estado |  |  | Time deposits |  |  |  | P-1 |  |  |  | A-1 |  |  |  | - |  |  |  | 500 |
BBVA Banco Francés |  |  | Time deposits |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 53 |
JP Morgan US dollar Liquidity Fund Institutional |  |  | Investment fund deposits |  |  |  | Aaa-mf |  |  |  | AAAm |  |  |  | AAAmmf |  |  |  | 181,155 |
Legg Mason - Western Asset Institutional cash reserves |  |  | Investment fund deposits |  |  |  | - |  |  |  | AAAm |  |  |  | AAAmmf |  |  |  | 146,078 |
Total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 476, 332 |
Financial institution |  | Financial assets |  |  | Rating Institution |  |  | As of December ‎ 31, 2019 |
|  |  |  |  | Moody´s |  |  | S&P |  |  | Fitch |  |  | ThUS$ |
Banco Scotiabank Sud Americano |  |  | 90 days to 1 year |  |  |  | P-2 |  |  |  | - |  |  |  | - |  |  |  | 54,180 |
Banco de Crédito e Inversiones (*) |  |  | 90 days to 1 year |  |  |  | P-1 |  |  |  | A-1 |  |  |  | - |  |  |  | 178,448 |
Banco Santander |  |  | 90 days to 1 year |  |  |  | P-1 |  |  |  | A-1 |  |  |  | - |  |  |  | 74,365 |
Banco Itau Corpbanca |  |  | 90 days to 1 year |  |  |  | P-2 |  |  |  | A-2 |  |  |  | - |  |  |  | 127,579 |
Banco Security |  |  | 90 days to 1 year |  |  |  | - |  |  |  | A-2 |  |  |  | F2 |  |  |  | 17,965 |
Banco de Chile |  |  | 90 days to 1 year |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 18,026 |
Banco Estado |  |  | 90 days to 1 year |  |  |  | P-1 |  |  |  | A-1 |  |  |  | - |  |  |  | 15,126 |
Total |  |  |  | 485,689 |
(*) This includes ThUS$ 1,870 associated with collateral in guarantee used to reduce the liquidity risk.
The following table presents comparative information as of December 2018:
Financial institution |  | Financial assets |  |  | Rating Institution |  |  | As of December ‎ 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 |
Scotiabank Sud Americano |  |  | Time deposits |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 86,222 |
JP Morgan US dollar Liquidity Fund Institutional |  |  | Investment fund deposits |  |  |  | Aaa-mf |  |  |  | AAAm |  |  |  | AAAmmf |  |  |  | 133,809 |
Legg Mason - Western Asset Institutional cash reserves |  |  | Investment fund deposits |  |  |  | - |  |  |  | AAAm |  |  |  | AAAmmf |  |  |  | 132,108 |
Total |  |  |  | 453,583 |
Financial institution |  | Financial assets |  |  | Rating Institution |  |  | As of December ‎ 31, 2018 |
|  |  |  |  | Moody´s |  |  | S&P |  |  | Fitch |  |  | ThUS$ |
Banco Scotiabank |  |  | 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 Itau Corpbanca |  |  | 90 days to 1 year |  |  |  | P-2 |  |  |  | A-2 |  |  |  | - |  |  |  | 70,719 |
Banco Security |  |  | 90 days to 1 year |  |  |  | - |  |  |  | - |  |  |  | - |  |  |  | 27,215 |
Total |  |  |  | 291,790 |
Disclosure of cash and cash equivalents of cashflows [Text Block] | The position in other cash and cash equivalents is invested in highly liquid mutual funds with an AAA risk rating.
|  | Nature of undiscounted cash flows |
As of December 31, 2019 (in millions of US$) |  | Carrying ‎ amount |  |  | Less than 1 year |  |  | 1 to 5 years |  |  | Over 5 years |  |  | Total |
Bank borrowings |  |  | 70.19 |  |  |  | 2.17 |  |  |  | 74.87 |  |  |  | - |  |  |  | 77.04 |
Unsecured obligations (1) |  |  | 1,697.11 |  |  |  | 326.34 |  |  |  | 614.29 |  |  |  | 1,184.38 |  |  |  | 2,125.01 |
Sub total |  |  | 1,767.30 |  |  |  | 328.51 |  |  |  | 689.16 |  |  |  | 1,184.38 |  |  |  | 2,202.05 |
Hedging liabilities |  |  | 23.66 |  |  |  | 6.57 |  |  |  | 24.33 |  |  |  | 32.37 |  |  |  | 63.27 |
Derivative financial instruments |  |  | 3.17 |  |  |  | 3.17 |  |  |  | - |  |  |  | - |  |  |  | 3.17 |
Sub total |  |  | 26.83 |  |  |  | 9.74 |  |  |  | 24.33 |  |  |  | 32.37 |  |  |  | 66.44 |
Current and non-current lease liabilities |  |  | 42.632 |  |  |  | 8.903 |  |  |  | 22.983 |  |  |  | 10.746 |  |  |  | 42.632 |
Trade accounts payable and other accounts payable |  |  | 205.7 |  |  |  | 205.7 |  |  |  | - |  |  |  | - |  |  |  | 205.70 |
Total |  |  | 2,042.462 |  |  |  | 552.853 |  |  |  | 736.473 |  |  |  | 1,227.496 |  |  |  | 2,516.822 |
(1) Unsecured obligations are presented on a contractual basis and have no effects related to anticipated redemptions.
|  | Nature of undiscounted cash flows |
As of December 31, 2018 (in millions of US$) |  | Carrying ‎ amount |  |  | Less than 1 year |  |  | 1 to 5 years |  |  | Over 5 years |  |  | Total |
Bank borrowings |  |  | 70.25 |  |  |  | 4.10 |  |  |  | 79.66 |  |  |  | - |  |  |  | 83.76 |
Unsecured obligations |  |  | 1,273.07 |  |  |  | 61.37 |  |  |  | 823.76 |  |  |  | 713.60 |  |  |  | 1,598.73 |
Sub total |  |  | 1,343.32 |  |  |  | 65.47 |  |  |  | 903.42 |  |  |  | 713.60 |  |  |  | 1,682.49 |
Hedging liabilities |  |  | 17.32 |  |  |  | 5.52 |  |  |  | 15.64 |  |  |  | 29.27 |  |  |  | 50.43 |
Derivative financial instruments |  |  | 2.86 |  |  |  | 2.86 |  |  |  | - |  |  |  | - |  |  |  | 2.86 |
Sub total |  |  | 20.18 |  |  |  | 8.38 |  |  |  | 15.64 |  |  |  | 29.27 |  |  |  | 53.29 |
Trade accounts payable and other accounts payable |  |  | 163.75 |  |  |  | 163.17 |  |  |  | 0.58 |  |  |  | - |  |  |  | 163.75 |
Total |  |  | 1,527.25 |  |  |  | 237.02 |  |  |  | 919.64 |  |  |  | 742.87 |  |  |  | 1,899.53 |

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