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Financial instruments (Details Textual) |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |
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Jan. 22, 2020 USD ($) | May 07, 2019 USD ($) | Nov. 08, 2018 USD ($) | Mar. 31, 2018 CLF ( ) | Apr. 03, 2013 USD ($) | Apr. 04, 2012 USD ($) | Jan. 13, 2009 USD ($) | Oct. 23, 2014 USD ($) | Apr. 21, 2010 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jul. 05, 2020 USD ($) | Jul. 05, 2020 CLF ( ) | Jan. 05, 2020 USD ($) | Jan. 05, 2020 CLF ( ) | Jul. 05, 2019 USD ($) | Jul. 05, 2019 CLF ( ) | Oct. 31, 2018 CLF ( ) | Jan. 15, 2018 | Apr. 04, 2012 CLF ( ) | Jan. 13, 2009 CLF ( )
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  | $ 39,031,000 | $ 282,914,000 |  |  |  |  |  |  |  |  |  |
Outstanding purchase commitments |  |  |  |  |  |  |  |  |  | 55,516,000 | 89,391,000 |  |  |  |  |  |  |  |  |  |
Single series bond One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  | $ 4,648,000 | $ 252,674,000 |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  | 1.95% | 0.43% |  |  |  |  |  |  |  |  |  |
Borrowings, maturity |  |  |  |  |  |  |  |  |  | 01/28/2021 | 04/21/2020 |  |  |  |  |  |  |  |  |  |
Single series bond One [Member] | Bonds issued [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  | 5.50% |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, maturity |  |  |  |  |  |  |  |  | 10 |  |  |  |  |  |  |  |  |  |  |  |
Single series bond Three [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  | $ 7,508,000 | $ 2,658,000 |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  | 3.59% | 1.42% |  |  |  |  |  |  |  |  |  |
Borrowings, maturity |  |  |  |  |  |  |  |  |  | 05/07/2021 | 04/03/2020 |  |  |  |  |  |  |  |  |  |
Single series bond Three [Member] | Bonds issued [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  | $ 300,000,000 |  |  |  |  | $ 300,000,000 |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  | 3.625% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, maturity |  |  |  |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Single series bond Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  | $ 2,658,000 | $ 4,648,000 |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  | 1.08% | 2.35% |  |  |  |  |  |  |  |  |  |
Borrowings, maturity |  |  |  |  |  |  |  |  |  | 04/03/2021 | 01/28/2020 |  |  |  |  |  |  |  |  |  |
Single series bond Two [Member] | Bonds issued [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  | $ 250,000,000 |  | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  | 4.375% |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, maturity |  |  |  |  |  |  |  | 2025 |  |  |  |  |  |  |  |  |  |  |  |  |
Series H bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  | $ 18,212,000 | $ 17,166,000 |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  | 0.58% | 1.36% |  |  |  |  |  |  |  |  |  |
Borrowings, maturity |  |  |  |  |  |  |  |  |  | 01/05/2021 | 01/05/2020 |  |  |  |  |  |  |  |  |  |
Series H bonds [Member] | Bonds issued [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  | $ 139,216,000 |  |  |  |  | $ 6,509,000 | 181,818.18 | $ 6,787,000 | 181,818.18 | $ 7,494,000 | 181,818.18 |  |  |  | 4,000,000
Borrowings, interest rate |  |  |  |  |  |  | 4.90% |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.90%
Borrowings, maturity |  |  |  |  |  |  | 21 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series Q bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  | $ 350,000 | $ 323,000 |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  | 2.92% | 3.11% |  |  |  |  |  |  | 3.45% |  |  |
Borrowings, maturity |  |  |  |  |  |  |  |  |  | 06/01/2021 | 06/01/2020 |  |  |  |  |  |  |  |  |  |
Proceeds from disposal or maturity of available-for-sale financial assets |  |  | $ 83,567,623,842 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bond Authorised to Issue | |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,000,000 |  |  |
Series P bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  | $ 1,824,000 | $ 1,686,000 |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  | 2.37% | 2.71% |  |  |  |  |  |  |  |  |  |
Borrowings, maturity |  |  |  |  |  |  |  |  |  | 01/15/2021 | 01/15/2020 |  |  |  |  |  |  |  |  |  |
Series P bonds [Member] | Bonds issued [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | |  |  |  | 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.25% |  |
Borrowings, maturity |  |  |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series M Bonds [Member] | Bonds issued [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | $ 69,901,000 |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,500,000 |
Borrowings, interest rate |  |  |  |  |  | 3.80% |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.80% |
Borrowings, maturity |  |  |  |  |  | 21 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Bonds [Member] | Bonds issued [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  | $ 450,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  | 4.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, maturity |  | 2029 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Single Series Bond Six [Member] | Bonds issued [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount | $ 400,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate | 4.25% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, maturity | 2050 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cross currency swap contracts [Member] | Series H bonds [Member] | Bonds issued [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  |  |  | $ 546,000 |  | $ 268,000 |  | $ 439,000 |  |  |  |  |

X
- Definition The interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_7&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The maturity of borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2020-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2020-en-r&anchor=para_7&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The nominal or face amount of a financial instrument, used to calculate payments made on that instrument. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_112_c&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Amount of bonds authorised to issue. + References No definition available. + Details
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- Definition The amount of purchase orders outstanding. + References No definition available. + Details
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