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v3.26.1

income taxes - Rate reconciliations (Details) - CAD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025
Reconciliation of effective tax rate |  |  |  |
Income taxes computed at applicable statutory rates | $ (503) | $ (55) | $ (450) | $ 46
Adjustments recognized in the current period for income taxes of prior periods | (15) | (18) | (15) | (23)
Pillar Two global minimum tax | 1 |  | 1 | 1
Impairment of intangible assets and goodwill | 229 | 107 | 229 | 107
Write down of deferred tax asset | 89 |  | 89 |
(Non-taxable) non-deductible amounts, net | (5) | 4 | (12) | 3
Withholding and other taxes | 5 | 10 | 13 | 19
Losses not recognized | 38 | 2 | 39 | 3
Foreign tax differential | (1) | (2) | (1) | (3)
Other |  | (1) |  | 1
Income tax expense (recovery) per Consolidated statements of income and other comprehensive income | $ (162) | $ 47 | $ (107) | $ 154
Reconciliation of effective tax rate (as a percent) |  |  |  |
Income taxes computed at applicable statutory rates (as a percent) | 25.30% | 27.80% | 25.10% | 21.90%
Adjustments recognized in the current period for income taxes of prior periods (as a percent) | 0.80% | 9.10% | 0.80% | (11.00%)
Pillar Two global minimum tax (as a percent) | (0.10%) |  | (0.10%) | 0.50%
Impairment of intangible assets and goodwill (as a percent) | (11.60%) | (53.90%) | (12.80%) | 51.00%
Write down of deferred tax asset (as a percent) | (4.50%) |  | (5.00%) |
(Non-taxable) non-deductible amounts, net (as a percent) | 0.30% | (2.00%) | 0.70% | 1.40%
Withholding and other taxes (as a percent) | (0.30%) | (5.10%) | (0.70%) | 9.00%
Losses not recognized (as a percent) | (1.90%) | (1.00%) | (2.10%) | 1.40%
Foreign tax differential (as a percent) | 0.10% | 1.00% | 0.10% | (1.40%)
Other (as a percent) |  | 0.40% |  | 0.50%
Income tax expense (recovery) per Consolidated statements of income and other comprehensive income (as a percent) | 8.10% | (23.70%) | 6.00% | 73.30%

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- Definition The tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from tax withholding and others. + References No definition available. + Details
Name: | tu_TaxRateEffectOfTaxesWithholdingAndOther
Namespace Prefix: | tu_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tax rate effect on the reconciliation between the average effective tax rate and the applicable tax rate resulting from the write down of deferred tax asset. + References No definition available. + Details
Name: | tu_TaxRateEffectOfWriteDownOfDeferredTaxAsset
Namespace Prefix: | tu_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration