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restructuring and other costs (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
restructuring and other costs |  |
Goods and services purchased | $ 194 | $ 190
Employee benefits expense | 299 | 528
Total | 493 | 718
Restructuring |  |
restructuring and other costs |  |
Goods and services purchased | 178 | 178
Employee benefits expense | 305 | 440
Total | 483 | 618
Real estate rationalization-related restructuring impairments of property, plant and equipment | 82 | 73
Reversal of real estate rationalization | 38 | 0
Other |  |
restructuring and other costs |  |
Goods and services purchased | 16 | 12
Employee benefits expense | (6) | 88
Total | $ 10 | $ 100

X
- Definition Amount of real estate rationalization-related restructuring impairments of property, plant and equipment. + References No definition available. + Details
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Namespace Prefix: | tu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of expense relating to restructuring and other costs with the objective of reducing ongoing costs and atypical charges when undertaking major or transformational changes to the business or operating models. + References No definition available. + Details
Name: | tu_RestructuringAndOtherCosts
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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
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X
- Definition Represents employee benefits expense incurred as restructuring and other costs under an authorized plan. + References No definition available. + Details
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X
- Definition Represents costs of goods and services purchased incurred as restructuring and other costs under an authorized plan. + References No definition available. + Details
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X
- Definition Amount of reversal of real estate rationalization-related restructuring impairments of property, plant and equipment + References No definition available. + Details
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X
- Details
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Balance Type: |
Period Type: |

X
- Details
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Data Type: | na
Balance Type: |
Period Type: |