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Financial instruments (Details Textual)							1 Months Ended		12 Months Ended
	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

X

- 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
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- Definition

The maturity of borrowings. [Refer: Borrowings]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
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-IssueDate 2019-01-01
-Paragraph 7
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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
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-IssueDate 2019-01-01
-Paragraph 112
-Subparagraph c
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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
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-IssueDate 2019-01-01
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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
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- Definition

Amount of bonds authorised to issue.

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- Definition

The amount of purchase orders outstanding.

+ References

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- Definition

The percentage of bonds issue price with respect to capital.

+ References

No definition available.

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The percentage of funds from sale of financial assets used for expansion.

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