XML 192 R162.htm IDEA: XBRL DOCUMENT v3.25.0.1

Common Shares - Narrative (Details) - CAD ($) $ / shares in Units, $ in Millions			12 Months Ended
	Feb. 19, 2025	Dec. 09, 2024	Dec. 31, 2024	Dec. 31, 2023	May 27, 2024
Disclosure of classes of share capital [line items]
Provision for repurchase of common shares under ASPP				$ 19
Dividends declared per share (in CAD per share)		$ 0.06
Declared After Quarter End Date
Disclosure of classes of share capital [line items]
Dividends declared per share (in CAD per share)	$ 0.065
NCIB Program
Disclosure of classes of share capital [line items]
Repurchase of maximum common shares (in shares)					14,000,000
Common shares
Disclosure of classes of share capital [line items]
Provision for repurchase of common shares under ASPP			$ 0	$ 19
Common shares | Shareholder Rights Plan | Minimum
Disclosure of classes of share capital [line items]
Common shares acquired, percentage			20.00%

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfClassesOfShareCapitalLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount, per share, of dividends proposed or declared before financial statements were authorised for issue but not recognised as distribution to owners.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 137
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_137_a&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_DividendsProposedOrDeclaredBeforeFinancialStatementsAuthorisedForIssueButNotRecognisedAsDistributionToOwnersPerShare
Namespace Prefix:	ifrs-full_
Data Type:	dtr-2022:perShareItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Shareholder Rights Plan, Percentage Of Outstanding Common Shares Potentially Purchased At Which Shareholder Rights Are Exercisable

+ References

No definition available.

+ Details

Name:	tac_ShareholderRightsPlanPercentageOfOutstandingCommonSharesPotentiallyPurchasedAtWhichShareholderRightsAreExercisable
Namespace Prefix:	tac_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Stock Purchase Agreement, Shares, Number Authorized

+ References

No definition available.

+ Details

Name:	tac_StockPurchaseAgreementSharesNumberAuthorized
Namespace Prefix:	tac_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Stock Repurchased During Period, Value 1

+ References

No definition available.

+ Details

Name:	tac_StockRepurchasedDuringPeriodValue1
Namespace Prefix:	tac_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	ifrs-full_NonadjustingEventsAfterReportingPeriodAxis=tac_DeclaredAfterQuarterEndDateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfShareCapitalAxis=tac_NCIBProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfShareCapitalAxis=tac_CommonsharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	tac_PlanName1Axis=tac_ShareholderRightsPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: