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Employee future benefits - Composition of Plan Assets (Details) | Dec. 31, 2021 | Dec. 31, 2020
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Employee Benefits [Abstract] |  |
Cash and cash equivalents | 3.00% | 3.00%
Equity securities | 60.00% | 61.00%
Debt securities | 37.00% | 36.00%
Total | 100.00% | 100.00%

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- Definition Employee Benefits [Abstract] + References No definition available. + Details
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- Definition Plan Assets At Fair Value, Allocation Percentage + References No definition available. + Details
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- Definition The percentage cash and cash equivalents contribute to the fair value of defined benefit plan assets. [Refer: Cash and cash equivalents; Plan assets, at fair value; Defined benefit plans [member]] [Contrast: Cash and cash equivalents, amount contributed to fair value of plan assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 142 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_142_a&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The percentage instruments representing debt (rather than equity) contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]] [Contrast: Debt instruments, amount contributed to fair value of plan assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 142 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_142_c&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The percentage equity instruments contribute to the fair value of defined benefit plan assets. [Refer: Plan assets, at fair value; Defined benefit plans [member]] [Contrast: Equity instruments, amount contributed to fair value of plan assets] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2021-01-01 -Paragraph 142 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_142_b&doctype=Standard -URIDate 2021-03-24 + Details
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