Employee future benefits (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Defined contribution pension plans
Matching contribution to employees' 5% contribution (in percent)	100.00%	100.00%
Defined benefit pension expense	$ 7.0	$ 3.0	$ 2.0
Obligation for defined benefit pension plans	11.0	15.0	9.0
Pension plans
Defined contribution pension plans
Defined benefit pension expense	1.0	1.0	1.0
TELUS Corporation (parent) \| Pension plans
Defined contribution pension plans
Defined benefit pension expense	$ 1.0	$ 0.0	$ 0.0

The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2021-01-01
-Paragraph 140
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_140_a&doctype=Standard
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- Definition

The amount of post-employment benefit expense relating to defined contribution plans. Defined contribution plans are post-employment benefit plans under which an entity pays fixed contributions into a separate entity (a fund) and will have no legal or constructive obligation to pay further contributions if the fund does not hold sufficient assets to pay all employee benefits relating to employee service in the current and prior periods.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 19
-IssueDate 2021-01-01
-Paragraph 53
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=19&code=ifrs-tx-2021-en-r&anchor=para_53&doctype=Standard
-URIDate 2021-03-24

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- Definition

The percentage of employer matching contribution to employee's first 5% contribution to defined contribution plan.

+ References

No definition available.

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- Definition

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+ References

No definition available.

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