XML 169 R116.htm IDEA: XBRL DOCUMENT
v3.25.0.1

employee future benefits - Assumptions (Details) - Pension plans $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 CAD ($) | Dec. 31, 2023 CAD ($)
Financial assumptions |  |
Life expectancy at 65 for a member currently at age 65 (years) | 24.3 | 24.2
Discount rate used to determine net benefit costs | 4.65% | 5.05%
Discount rate used to determine defined benefit obligations | 4.65% | 4.65%
Discount rate used to determine current service cost in subsequent fiscal year | 4.80% | 4.65%
Rate of future increases in compensation used to determine net benefit costs | 3.00% | 3.00%
Rate of future increases in compensation used to defined benefit obligations | 3.00% | 3.00%
Sensitivity of key assumptions |  |
Increase in life expectancy in actuarial assumption | 1 year | 1 year
Decrease in actuarial assumption (as a per cent) | 0.25% | 0.25%
Life expectancy |  |
Sensitivity of key assumptions |  |
Effect of increase in actuarial assumption on obligation | $ 242 | $ 238
Effect of increase in actuarial assumption on expense | 2 | 8
Discount rate |  |
Sensitivity of key assumptions |  |
Effect of decrease in actuarial assumption on expense | 4 | 10
Effect of decrease in actuarial assumption on obligation | 250 | 256
Rate of future increases in compensation |  |
Sensitivity of key assumptions |  |
Effect of decrease in actuarial assumption on expense | (1) | (2)
Effect of decrease in actuarial assumption on obligation | $ (20) | $ (23)

X
- Definition The discount rate used as the significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [domain]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_144&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_ActuarialAssumptionOfDiscountRates
Namespace Prefix: | ifrs-full_
Data Type: | dtr-2022:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The expected rate of salary increases used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit plans [domain]; Defined benefit obligation, at present value; Actuarial assumptions [domain]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_144&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_ActuarialAssumptionOfExpectedRatesOfSalaryIncreases
Namespace Prefix: | ifrs-full_
Data Type: | dtr-2022:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The mortality rate used as a significant actuarial assumption to determine the present value of a defined benefit obligation. [Refer: Defined benefit obligation, at present value; Actuarial assumptions [domain]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_144&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_ActuarialAssumptionOfMortalityRates
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition The increase (decrease) in a defined benefit obligation that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_145_a&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_IncreaseDecreaseInDefinedBenefitObligationDueToReasonablyPossibleDecreaseInActuarialAssumption
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The increase (decrease) in a defined benefit obligation that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. [Refer: Actuarial assumptions [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_145_a&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_IncreaseDecreaseInDefinedBenefitObligationDueToReasonablyPossibleIncreaseInActuarialAssumption
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The reasonably possible percentage of the decrease in the actuarial assumption used to determine the present value of defined benefit obligation. [Refer: Actuarial assumptions [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2024-01-01 -Paragraph 145 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2024-en-r&anchor=para_145_a&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_PercentageOfReasonablyPossibleDecreaseInActuarialAssumption
Namespace Prefix: | ifrs-full_
Data Type: | dtr-2022:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The discount rate used as the significant actuarial assumption to determine current service cost in subsequent fiscal year. + References No definition available. + Details
Name: | tu_ActuarialAssumptionOfDiscountRatesCurrentServiceCostInSubsequentYear
Namespace Prefix: | tu_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The discount rate used as the significant actuarial assumption to determine net benefit costs. + References No definition available. + Details
Name: | tu_ActuarialAssumptionOfDiscountRatesNetBenefitCosts
Namespace Prefix: | tu_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The rate of future increases in compensation used as the significant actuarial assumption to determine net benefit costs. + References No definition available. + Details
Name: | tu_ActuarialAssumptionOfRateOfFutureIncreaseNetBenefitCosts
Namespace Prefix: | tu_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition No documentation available. + References No definition available. + Details
Name: | tu_DefinedBenefitPlansFinancialAssumptionsAbstract
Namespace Prefix: | tu_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | tu_DefinedBenefitPlansSensitivityOfKeyAssumptionsAbstract
Namespace Prefix: | tu_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The increase (decrease) in a defined benefit plan expense that would have been caused by a decrease in a significant actuarial assumption that was reasonably possible at the end of the reporting period. + References No definition available. + Details
Name: | tu_IncreaseDecreaseInDefinedBenefitPlanExpenseDueToReasonablyPossibleDecreaseInActuarialAssumption
Namespace Prefix: | tu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The increase (decrease) in a defined benefit plan expense that would have been caused by an increase in a significant actuarial assumption that was reasonably possible at the end of the reporting period. + References No definition available. + Details
Name: | tu_IncreaseDecreaseInDefinedBenefitPlanExpenseDueToReasonablyPossibleIncreaseInActuarialAssumption
Namespace Prefix: | tu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The reasonably possible increase life expectancy in the actuarial assumption used to determine the present value of defined benefit obligation, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | tu_PeriodOfReasonablyPossibleIncreaseInLifeExpectancy
Namespace Prefix: | tu_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_DefinedBenefitPlansAxis=ifrs-full_DefinedBenefitPlansOtherThanMultiemployerPlansStatePlansAndPlansThatShareRisksBetweenEntitiesUnderCommonControlMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ActuarialAssumptionsAxis=tu_ActuarialAssumptionOfLifeExpectancyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ActuarialAssumptionsAxis=ifrs-full_ActuarialAssumptionOfDiscountRatesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ActuarialAssumptionsAxis=ifrs-full_ActuarialAssumptionOfExpectedRatesOfSalaryIncreasesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |