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v3.26.1

revenue from contracts with customers - Contract assets (Details) - CAD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2026 | Jun. 30, 2025 | Jun. 30, 2026 | Jun. 30, 2025 | Dec. 31, 2025
Contract assets |  |  |  |  |
Contract assets at beginning of period | $ 849 | $ 913 | $ 864 | $ 939 |
Net additions arising from operations | 433 | 370 | 865 | 748 |
Amounts billed in the period and thus reclassified to accounts receivable | (464) | (421) | (913) | (830) |
Change in impairment allowance, net | (1) | (1) | (1) | 4 |
Other |  | 1 | 2 | 1 |
Contract assets at end of period | 817 | 862 | 817 | 862 |
Reconciliation of contract assets presented in the Consolidated statements of financial position - current |  |  |  |  |
Gross contract assets | 554 | 589 | 554 | 589 |
Reclassification to contract liabilities of contracts with contract assets less than contract liabilities | (13) | (17) | (13) | (17) |
Reclassification from contract liabilities of contracts with contract liabilities less than contract assets | (108) | (119) | (108) | (119) |
Current contract assets | $ 433 | $ 453 | $ 433 | $ 453 | $ 457

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- Definition The amount of an entity’s right to consideration in exchange for goods or services that the entity has transferred to a customer, when that right is conditioned on something other than the passage of time (for example, the entity’s future performance). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2025-01-01 -Paragraph 105 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2025-en-r&anchor=para_105&doctype=Standard -URIDate 2025-03-27 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2025-01-01 -Paragraph 116 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2025-en-r&anchor=para_116_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 105 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_105_a&doctype=Standard -URIDate 2025-03-27 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2027-01-01 -Name IFRS -Number 19 -IssueDate 2025-01-01 -Paragraph 105 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=19&code=ifrs-tx-2025-en-r&anchor=para_105_a&doctype=Standard -URIDate 2025-03-27 + Details
Name: | ifrs-full_ContractAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
Name: | ifrs-full_ContractAssetsAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of current contract assets. [Refer: Contract assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2025-01-01 -Paragraph 105 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2025-en-r&anchor=para_105&doctype=Standard -URIDate 2025-03-27 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of current contract assets before reclassifications into and out of contract liabilities. + References No definition available. + Details
Name: | tu_CurrentContractAssetsBeforeReclassificationIntoOutOfContractLiabilities
Namespace Prefix: | tu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The decrease in contract assets resulting from reclassification to accounts receivable. + References No definition available. + Details
Name: | tu_DecreaseThroughReclassifiedToAccountsReceivableContractAssets
Namespace Prefix: | tu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The increase (decrease) in contract assets resulting from other activities. + References No definition available. + Details
Name: | tu_IncreaseDecreaseContractAssetsOther
Namespace Prefix: | tu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Increase (decrease) in impairment allowance for credit losses of financial assets. + References No definition available. + Details
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Namespace Prefix: | tu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The increase in contract assets resulting from operational activities during the period. + References No definition available. + Details
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Namespace Prefix: | tu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Reclassification from contract liabilities for contracts with contract liabilities less than contract assets. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Reclassification of current contract assets to contract liabilities for contracts with contract assets less than contract liabilities. + References No definition available. + Details
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Namespace Prefix: | tu_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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