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employee future benefits - Defined benefit pension plans - summary (Details) - CAD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025 | Dec. 31, 2025
Other comprehensive income |  |  |  |  |
Discount rate used to determine defined benefit obligations | 5.03% |  | 5.03% |  | 4.90%
Total | $ 1 | $ (36) | $ (16) | $ (35) |
Effect of asset ceiling |  |  |  |  |
Other comprehensive income |  |  |  |  |
Changes in the effect of limiting net defined benefit plan assets to the asset ceiling |  |  | 1,463 |  | $ 1,351
Pension plans | Pension plan | Plan assets |  |  |  |  |
Employee benefits expense |  |  |  |  |
Employees' contributions | 5 | 5 | 9 | 9 |
Administrative fees | (1) | (1) | (2) | (2) |
Total | 4 | 4 | 7 | 7 |
Financing costs |  |  |  |  |
Notional income on plan assets and interest on defined benefit obligations accrued | 114 | 108 | 229 | 215 |
Interest effect on asset ceiling limit | (16) | (15) | (33) | (29) |
Total | 98 | 93 | 196 | 186 |
Other comprehensive income |  |  |  |  |
Plan assets - Difference between actual results and estimated plan assumptions | 216 | (15) | 153 | 38 |
Changes in the effect of limiting net defined benefit plan assets to the asset ceiling | (32) | (99) | (79) | (103) |
Total | 184 | (114) | 74 | (65) |
AMOUNTS INCLUDED IN OPERATING ACTIVITIES CASH FLOWS |  |  |  |  |
Employer contributions |  |  | 9 | 10 |
BENEFITS PAID BY PLANS |  |  | (234) | (234) |
PLAN ACCOUNT BALANCES |  |  |  |  |
Change in period |  |  | 52 | (96) |
Balance at beginning of period |  |  | 8,258 | 8,262 | 8,262
Balance at end of period | 8,310 | 8,166 | 8,310 | 8,166 | 8,258
Pension plans | Pension plan | Plan assets | Pension plans that have plan assets in excess of defined benefit obligations accrued |  |  |  |  |
PLAN ACCOUNT BALANCES |  |  |  |  |
Balance at end of period | 8,301 | 8,157 | 8,301 | 8,157 |
Pension plans | Pension plan | Plan assets | Pension plans that have defined benefit obligations accrued in excess of plan assets |  |  |  |  |
PLAN ACCOUNT BALANCES |  |  |  |  |
Balance at end of period | 9 | 9 | 9 | 9 |
Pension plans | Pension plan | Plan assets | Pension plans that have defined benefit obligations accrued in excess of plan assets - Funded |  |  |  |  |
PLAN ACCOUNT BALANCES |  |  |  |  |
Balance at end of period | 9 | 9 | 9 | 9 |
Pension plans | Pension plan | Defined benefit obligation accrued |  |  |  |  |
Employee benefits expense |  |  |  |  |
Benefits earned for current service | (18) | (18) | (34) | (36) |
Benefits earned for past service | (4) |  | (4) |  |
Total | (22) | (18) | (38) | (36) |
Financing costs |  |  |  |  |
Notional income on plan assets and interest on defined benefit obligations accrued | (102) | (96) | (203) | (192) |
Total | (102) | (96) | (203) | (192) |
Other comprehensive income |  |  |  |  |
Changes in plan financial assumptions | (185) | 150 | (58) | 100 |
Total | (185) | 150 | (58) | 100 |
AMOUNTS INCLUDED IN OPERATING ACTIVITIES CASH FLOWS |  |  |  |  |
BENEFITS PAID BY PLANS |  |  | 234 | 234 |
PLAN ACCOUNT BALANCES |  |  |  |  |
Change in period |  |  | (65) | 106 |
Balance at beginning of period |  |  | (8,476) | (8,452) | (8,452)
Balance at end of period | (8,541) | (8,346) | (8,541) | (8,346) | (8,476)
Pension plans | Pension plan | Defined benefit obligation accrued | Pension plans that have plan assets in excess of defined benefit obligations accrued |  |  |  |  |
PLAN ACCOUNT BALANCES |  |  |  |  |
Balance at end of period | (8,067) | (7,896) | (8,067) | (7,896) |
Pension plans | Pension plan | Defined benefit obligation accrued | Pension plans that have defined benefit obligations accrued in excess of plan assets |  |  |  |  |
PLAN ACCOUNT BALANCES |  |  |  |  |
Balance at end of period | (474) | (450) | (474) | (450) |
Pension plans | Pension plan | Defined benefit obligation accrued | Pension plans that have defined benefit obligations accrued in excess of plan assets - Funded |  |  |  |  |
PLAN ACCOUNT BALANCES |  |  |  |  |
Balance at end of period | (254) | (226) | (254) | (226) |
Pension plans | Pension plan | Defined benefit obligation accrued | Pension plans that have defined benefit obligations accrued in excess of plan assets - Unfunded |  |  |  |  |
PLAN ACCOUNT BALANCES |  |  |  |  |
Balance at end of period | (220) | (224) | (220) | (224) |
Pension plans | Pension plan | Net |  |  |  |  |
Employee benefits expense |  |  |  |  |
Total | (18) | (14) | (31) | (29) |
Financing costs |  |  |  |  |
Total | (4) | (3) | (7) | (6) |
DEFINED BENEFIT (COST) INCLUDED IN NET INCOME | (22) | (17) | (38) | (35) |
Other comprehensive income |  |  |  |  |
Total | (1) | 36 | 16 | 35 |
DEFINED BENEFIT (COST) INCLUDED IN COMPREHENSIVE INCOME | (23) | 19 | (22) |  |
AMOUNTS INCLUDED IN OPERATING ACTIVITIES CASH FLOWS |  |  |  |  |
Employer contributions |  |  | 9 | 10 |
PLAN ACCOUNT BALANCES |  |  |  |  |
Change in period |  |  | (13) | 10 |
Balance at beginning of period |  |  | (218) | (190) | (190)
Balance at end of period | (231) | (180) | (231) | (180) | $ (218)
Pension plans | Pension plan | Net | Pension plans that have plan assets in excess of defined benefit obligations accrued |  |  |  |  |
PLAN ACCOUNT BALANCES |  |  |  |  |
Balance at end of period | 234 | 261 | 234 | 261 |
Pension plans | Pension plan | Net | Pension plans that have defined benefit obligations accrued in excess of plan assets |  |  |  |  |
PLAN ACCOUNT BALANCES |  |  |  |  |
Balance at end of period | (465) | (441) | (465) | (441) |
Pension plans | Pension plan | Net | Pension plans that have defined benefit obligations accrued in excess of plan assets - Funded |  |  |  |  |
PLAN ACCOUNT BALANCES |  |  |  |  |
Balance at end of period | (245) | (217) | (245) | (217) |
Pension plans | Pension plan | Net | Pension plans that have defined benefit obligations accrued in excess of plan assets - Unfunded |  |  |  |  |
PLAN ACCOUNT BALANCES |  |  |  |  |
Balance at end of period | $ (220) | $ (224) | $ (220) | $ (224) |

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 2025-01-01 -Paragraph 144 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_144&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The decrease (increase) in a net defined benefit liability (asset) resulting from actuarial gains (losses) arising from changes in financial assumptions that result in remeasurements of the net defined benefit liability (asset). Financial assumptions deal with items such as: (a) the discount rate; (b) benefit levels, excluding any cost of the benefits to be met by employees, and future salary; (c) in the case of medical benefits, future medical costs, including claim handling costs (ie the costs that will be incurred in processing and resolving claims, including legal and adjuster's fees); and (d) taxes payable by the plan on contributions relating to service before the reporting date or on benefits resulting from that service. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 141 -Subparagraph c -Clause iii -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_141_c_iii&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The decrease (increase) in net defined benefit liability (asset) resulting from contributions to a defined benefit plan by the employer. [Refer: Net defined benefit liability (asset); Defined benefit plans [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 141 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_141_f&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition 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 [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 140 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_140_a&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 206 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_206_a&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 206 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_206_a&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The amount of other comprehensive income, before tax, related to gains (losses) on remeasurements of defined benefit plans, which comprise actuarial gains and losses; the return on plan assets, excluding amounts included in net interest on the net defined benefit liability (asset); and any change in the effect of the asset ceiling, excluding amounts included in net interest on the net defined benefit liability (asset). [Refer: Other comprehensive income; Defined benefit plans [domain]; Plan assets [member]; Net defined benefit liability (asset)] [Contrast: Decrease (increase) in net defined benefit liability (asset) resulting from gain (loss) on remeasurement in other comprehensive income] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 135 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_135_b&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 91 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_91_b&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 7 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_7&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from past service cost. Past service cost is the change in the present value of the defined benefit obligation for employee service in prior periods, resulting from a plan amendment (the introduction or withdrawal of, or changes to, a defined benefit plan) or a curtailment (a significant reduction by the entity in the number of employees covered by a plan). [Refer: Net defined benefit liability (asset); Defined benefit plans [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 141 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_141_d&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 207 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_207_d&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 207 -Subparagraph d -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_207_d&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from payments from the plan. [Refer: Net defined benefit liability (asset)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 141 -Subparagraph g -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_141_g&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 207 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_207_f&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 207 -Subparagraph f -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_207_f&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The decrease (increase) in the net defined benefit liability (asset) resulting from the return on plan assets, excluding amounts included in interest income or expense. The return on plan assets is interest, dividends and other revenue derived from the plan assets, together with realised and unrealised gains or losses on the plan assets, less any costs of managing plan assets and less any tax payable by the plan itself, other than tax included in the actuarial assumptions used to measure the present value of the defined benefit obligation. [Refer: Plan assets [member]; Net defined benefit liability (asset); Actuarial assumptions [domain]; Increase (decrease) in net defined benefit liability (asset) resulting from interest expense (income)] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2025-01-01 -Paragraph 141 -Subparagraph c -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2025-en-r&anchor=para_141_c_i&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 207 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_207_c&doctype=Standard -URIDate 2025-03-27 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 207 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_207_c&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The effect on the net defined benefit liability (asset) of expenses related to defined benefit plans that the entity classifies as being administrative. + References No definition available. + Details
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- Definition The amount of defined benefit (cost) included in net income (loss). + References No definition available. + Details
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- Definition The amount of interest effect on defined benefit plans asset ceiling limit recognized in financing costs. + References No definition available. + Details
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- Definition The total amount of post-employment benefit costs relating to defined benefit plan, including amounts charged to financing costs and to other comprehensive income. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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- Definition The increase (decrease) in the net defined benefit liability (asset) resulting from post-employment benefit expense included in profit or loss relating to defined benefit plans. + References No definition available. + Details
Name: | tu_TotalIncreaseDecreaseInNetDefinedBenefitLiabilityAssetResultingFromPostEmploymentBenefitExpenseIncludedInProfitOrLossRelatingToDefinedBenefitPlans
Namespace Prefix: | tu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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- Details
Name: | ifrs-full_CharacteristicsOfDefinedBenefitPlansAxis=ifrs-full_PensionDefinedBenefitPlansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_NetDefinedBenefitLiabilityAssetAxis=ifrs-full_PlanAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
Name: | ifrs-full_FundingArrangementsOfDefinedBenefitPlansAxis=tu_DefinedBenefitPlansWithAssetsInExcessOfObligationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_FundingArrangementsOfDefinedBenefitPlansAxis=tu_DefinedBenefitPlansWithObligationsInExcessOfAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_FundingArrangementsOfDefinedBenefitPlansAxis=tu_FundedDefinedBenefitPlanPensionPlansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_NetDefinedBenefitLiabilityAssetAxis=ifrs-full_PresentValueOfDefinedBenefitObligationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_FundingArrangementsOfDefinedBenefitPlansAxis=tu_UnfundedDefinedBenefitPlanPensionPlansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_NetDefinedBenefitLiabilityAssetAxis=tu_PresentValueNettingPlanAssetsAndDefinedBenefitObligationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |