XML 125 R95.htm IDEA: XBRL DOCUMENT v3.25.0.1

Asset Impairment Charges (Reversals) - Detailed Information About Property, Plant, and Equipment (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disclosure of detailed information about property, plant and equipment [line items]
Asset impairment charges (reversals)	$ 46	$ (48)	$ 9
Corporate | Kaybob Cogeneration Project
Disclosure of detailed information about property, plant and equipment [line items]
Asset impairment charges (reversals)	0	0	(2)
Hydro
Disclosure of detailed information about property, plant and equipment [line items]
Asset impairment charges (reversals)	0	(10)	21
Wind and Solar
Disclosure of detailed information about property, plant and equipment [line items]
Asset impairment charges (reversals)	0	(4)	43
Changes in decommissioning and restoration provisions on retired assets(1)
Disclosure of detailed information about property, plant and equipment [line items]
Asset impairment charges (reversals)	24	(34)	(53)
Project development costs
Disclosure of detailed information about property, plant and equipment [line items]
Asset impairment charges (reversals)	$ 22	$ 0	$ 0

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

X

- Definition

The amount of impairment loss or reversal of impairment loss recognised in profit or loss. [Refer: Impairment loss recognised in profit or loss; Reversal of impairment loss recognised in profit or loss]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 99
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_99&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_ImpairmentLossReversalOfImpairmentLossRecognisedInProfitOrLoss
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	ifrs-full_SegmentsAxis=tac_CorporateAndOther1Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_TypesOfInvestmentPropertyAxis=tac_KaybobCogenerationProjectMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=tac_HydroMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=tac_WindandSolarMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_ProvisionForDecommissioningRestorationAndRehabilitationCostsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=tac_ProjectDevelopmentCostsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: