XML 158 R118.htm IDEA: XBRL DOCUMENT
v3.20.4

employee future benefits - Other defined benefit plans (Details) - Other defined benefit plans - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
employee future benefits |  |
Other defined benefits | $ 3 | $ 2
Financing cost | 0 | 0
Other re-measurements recorded in other comprehensive income | 0 | $ 4
First year |  |
employee future benefits |  |
Estimated future benefit payments | 1 |
2 years hence |  |
employee future benefits |  |
Estimated future benefit payments | 1 |
3 years hence |  |
employee future benefits |  |
Estimated future benefit payments | 1 |
4 years hence |  |
employee future benefits |  |
Estimated future benefit payments | 1 |
5 years hence |  |
employee future benefits |  |
Estimated future benefit payments | 1 |
5 years hence to 10 years |  |
employee future benefits |  |
Estimated future benefit payments | $ 5 |

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

X
- Definition The estimated amount, at the balance sheet date, of the future benefit payments to be made during the specified period from defined benefit plans + References No definition available. + Details
Name: | tu_EstimatedFutureBenefitPaymentsFromDefinedBenefitPensionPlans
Namespace Prefix: | tu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of post-employment benefit expense relating to other defined benefit current service costs. + References No definition available. + Details
Name: | tu_OtherDefinedBenefits
Namespace Prefix: | tu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The total amount of post-employment benefit costs relating to defined benefit plan recognized in financing costs, including amounts charged to financing costs. + References No definition available. + Details
Name: | tu_PostemploymentBenefitCostsDefinedBenefitPlansInFinancingCost
Namespace Prefix: | tu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The total amount of post-employment benefit costs relating to defined benefit plan recognized in other comprehensive income. + References No definition available. + Details
Name: | tu_PostemploymentBenefitCostsDefinedBenefitPlansInOtherComprehensiveIncome
Namespace Prefix: | tu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_NotLaterThanOneYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanTwoYearsAndNotLaterThanThreeYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanThreeYearsAndNotLaterThanFourYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanFourYearsAndNotLaterThanFiveYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanFiveYearsAndNotLaterThanTenYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |