Long-term debt - Details of long-term debt (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Details of long-term debt
Long-term debt excluding Lease liabilities	$ 1,276	$ 1,452
Lease liabilities	249	298
Long-term debt	1,525	1,750
Current	116	122
Non-current	1,409	1,628
Credit facility
Details of long-term debt
Gross borrowings	1,284	1,463
Deferred debt transaction costs	$ (8)	$ (11)

The current portion of non-current borrowings. [Refer: Borrowings]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 55
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_55&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_CurrentPortionOfLongtermBorrowings
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of liabilities related to the entity's leases. Lease is a contract, or part of a contract, that conveys the right to use an underlying asset for a period of time in exchange for consideration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 16
-IssueDate 2024-01-01
-Paragraph 47
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2024-en-r&anchor=para_47_b&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_LeaseLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The non-current portion of non-current borrowings. [Refer: Borrowings]

+ References

+ Details

Name:	ifrs-full_LongtermBorrowings
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Pertains to details of long-term debt of the entity.

+ References

No definition available.

+ Details

Name:	tixt_DetailsOfLongTermDebtAbstract
Namespace Prefix:	tixt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Borrowings that are outstanding at the reporting date, excluding unamortized costs.

+ References

No definition available.

+ Details

Name:	tixt_GrossBorrowings
Namespace Prefix:	tixt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

No definition available.

+ Details

Name:	tixt_IfrsDeferredFinanceCostsNet
Namespace Prefix:	tixt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Total long-term borrowings, including the current and non-current portion.

+ References

No definition available.

+ Details

Name:	tixt_LongTermBorrowingsCurrentAndNonCurrent
Namespace Prefix:	tixt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Total long-term borrowings, including the current and non-current portion but excluding the lease liabilities.

+ References

No definition available.

+ Details

Name:	tixt_LongTermBorrowingsCurrentAndNonCurrentExcludingLeaseLiabilities
Namespace Prefix:	tixt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	ifrs-full_BorrowingsByNameAxis=tixt_CreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: