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Assets Held for Sale - Disclosure of Change in Assets Held for Sale (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Change in Assets Held for Sale [Roll Forward]
Beginning of the period	$ 25	$ 105
Transfers from property, plant and equipment	28	25
Disposals	(31)	(105)
End of the period	$ 22	$ 25

X

- Definition

The decrease in investment property resulting from disposals. [Refer: Investment property]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 40
-IssueDate 2022-03-24
-Paragraph 76
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=40&code=ifrs-tx-2022-en-r&anchor=para_76_c&doctype=Standard
-URIDate 2022-03-24

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 40
-IssueDate 2022-03-24
-Paragraph 79
-Subparagraph d
-Clause iii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=40&code=ifrs-tx-2022-en-r&anchor=para_79_d_iii&doctype=Standard
-URIDate 2022-03-24

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

The increase (decrease) in property, plant and equipment resulting from transfers from (to) investment property. [Refer: Property, plant and equipment; Investment property]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 16
-IssueDate 2022-03-24
-Paragraph 73
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2022-en-r&anchor=para_73_e&doctype=Standard
-URIDate 2022-03-24

+ Details

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

X

- Definition

The amount of non-current assets or disposal groups classified as held for sale or as held for distribution to owners. [Refer: Non-current assets or disposal groups classified as held for distribution to owners; Non-current assets or disposal groups classified as held for sale]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2022-03-24
-Paragraph 54
-Subparagraph j
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_54_j&doctype=Standard
-URIDate 2022-03-24

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Change in Assets Held for Sale

+ References

No definition available.

+ Details

Name:	tac_ChangeInAssetsHeldForSaleRollForward
Namespace Prefix:	tac_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration