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employee future benefits - Defined contribution pension plans (Details) | 12 Months Ended
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Dec. 31, 2018
Defined contribution pension plans |
Number of defined contribution plans | 3
Matching contribution to employees' 5% contribution | 100.00%
Employer matching contribution over 5% of employee's contribution | 80.00%
Minimum |
Defined contribution pension plans |
Employees contribution to the plan (as a per cent) | 3.00%
Maximum |
Defined contribution pension plans |
Employees contribution to the plan (as a per cent) | 6.00%
Employees' contribution 100% matched (as a per cent) | 5.00%

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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. + Details
Name: | tu_DefinedContributionEmployerMatchingContributionToEmployeesFivePercentContribution
Namespace Prefix: | tu_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The percentage of employees contribution to defined contribution plan that is fully matched by the entity. + References No definition available. + Details
Name: | tu_DefinedContributionPercentageOfEmployeesContributionMatchFullyByEmployer
Namespace Prefix: | tu_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
Name: | tu_DefinedContributionPlanAnnualContributionsPerEmployeePercent
Namespace Prefix: | tu_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage employer matches of the employee's percentage contribution matched over 5%. + References No definition available. + Details
Name: | tu_DefinedContributionPlanEmployerMatchingContributionPercentOfMatchOverFivePercent
Namespace Prefix: | tu_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | tu_IfrsDefinedContributionPlanLineItems
Namespace Prefix: | tu_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The number of defined contribution pension plans offered by the entity to eligible employees. + References No definition available. + Details
Name: | tu_NumberDefinedContributionPensionPlans
Namespace Prefix: | tu_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |