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Employee future benefits - Composition of Plan Assets (Details)	Dec. 31, 2021	Dec. 31, 2020
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%

X

- Definition

Employee Benefits [Abstract]

+ References

No definition available.

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- Definition

Plan Assets At Fair Value, Allocation Percentage

+ References

No definition available.

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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
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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

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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

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