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Financial instruments (Details Textual) |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |
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May 07, 2019 USD ($) | Nov. 08, 2018 USD ($) | Mar. 29, 2018 USD ($) | Apr. 03, 2013 USD ($) | Apr. 04, 2012 USD ($) | Jan. 13, 2009 USD ($) | Oct. 23, 2014 USD ($) | Apr. 21, 2010 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jul. 05, 2019 USD ($) | Jul. 05, 2019 CLF ( ) | Jan. 01, 2019 | Oct. 31, 2018 USD ($) | Jan. 15, 2018 | Apr. 04, 2012 CLF ( ) | Jan. 13, 2009 CLF ( )
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  | $ 148,728,000 | $ 16,796,000 |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.25% |  |
Outstanding purchase commitments |  |  |  |  |  |  |  |  | $ 101,280,000 | 59,919,000 |  |  |  |  |  |  |
Weighted Average Lessees Incremental Borrowing Rate |  |  |  |  |  |  |  |  | 8.08% |  |  |  | 8.08% |  |  |  |
Single series bond One [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  | $ 252,674,000 | $ 2,674,000 |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  | 0.43% | 0.95% |  |  |  |  |  |  |
Borrowings, maturity |  |  |  |  |  |  |  |  | 04-21-2020 | 04-21-2019 |  |  |  |  |  |  |
Single series bond One [Member] | Bonds issued [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  | $ 250,000 |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  | 5.50% |  |  |  |  |  |  |  |  |
Borrowings, maturity |  |  |  |  |  |  |  | 10 |  |  |  |  |  |  |  |  |
Single series bond Three [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  | $ 2,658,000 | $ 2,658,000 |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  | 1.42% | 1.77% |  |  |  |  |  |  |
Borrowings, maturity |  |  |  |  |  |  |  |  | 04-03-2020 | 04-03-2019 |  |  |  |  |  |  |
Single series bond Three [Member] | Bonds issued [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  | $ 300 |  |  |  |  | $ 300,000 |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  | 3.625% |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, maturity |  |  |  | 10 |  |  |  |  |  |  |  |  |  |  |  |  |
Single series bond Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  | $ 4,648,000 | $ 4,648,000 |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  | 2.35% | 2.75% |  |  |  |  |  |  |
Borrowings, maturity |  |  |  |  |  |  |  |  | 01-28-2020 | 01-28-2019 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |
Percentage of bonds issue price |  |  |  |  |  |  | 99.41% |  |  |  |  |  |  |  |  |  |
Series H bonds [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  | $ 17,166,000 | $ 3,756,000 |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  | 1.36% | 1.90% |  |  |  |  |  |  |
Borrowings, maturity |  |  |  |  |  |  |  |  | 01-05-2020 | 01-05-2019 |  |  |  |  |  |  |
Series H bonds [Member] | Bonds issued [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  | $ 139,216,000 |  |  |  |  | $ 7.494 | 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 |  |  |  |  |  |  |  |  | $ 323,000 | $ 342,000 |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  | 3.11% | 3.34% |  |  |  | 3.45% |  |  |
Borrowings, maturity |  |  |  |  |  |  |  |  | 06-01-2020 | 06-01-2019 |  |  |  |  |  |  |
Percentage Of Funds From Sale Of Financial Assets Used For Expansion |  | 90.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  | $ 1,686,000 | $ 1,784,000 |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  | 2.71% | 3.07% |  |  |  |  |  |  |
Borrowings, maturity |  |  |  |  |  |  |  |  | 01-15-2020 | 01-15-2019 |  |  |  |  |  |  |
Series P bonds [Member] | Bonds issued [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  | $ 3,000,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3.25% |  |
Borrowings, maturity |  |  | 10 year |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of bonds issue price | 99.984% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cross currency swap contracts [Member] | Series H bonds [Member] | Bonds issued [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Financial instruments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Notional amount |  |  |  |  |  |  |  |  |  |  | $ 439 |  |  |  |  |  |

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- Definition The interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2019-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_7&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 7 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_7&doctype=Standard -URIDate 2019-03-27 + 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 2019-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_112_c&doctype=Standard -URIDate 2019-03-27 + Details
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- Definition The cash inflow from the disposal or maturity of available-for-sale financial assets. [Refer: Financial assets available-for-sale] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2021-01-01 -Name IAS -Number 7 -IssueDate 2019-01-01 -Paragraph 16 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b -URIDate 2019-03-27 + Details
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- Definition The weighted average lessee's incremental borrowing rate applied to lease liabilities recognised in the statement of financial position at the date of initial application of IFRS 16. The incremental borrowing rate is the rate of interest that a lessee would have to pay to borrow over a similar term, and with a similar security, the funds necessary to obtain an asset of a similar value to the right-of-use asset in a similar economic environment. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2019-01-01 -Paragraph C12 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2019-en-r&anchor=para_C12_a&doctype=Appendix&subtype=C -URIDate 2019-03-27 + Details
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- Definition Amount of bonds authorised to issue. + References No definition available. + Details
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- 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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- Definition The percentage of bonds issue price with respect to capital. + References No definition available. + Details
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- Definition The percentage of funds from sale of financial assets used for expansion. + References No definition available. + Details
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