XML 179 R144.htm IDEA: XBRL DOCUMENT v3.22.4

Decommissioning and Other Provisions - Change in Decommissioning and Other Provision Balances (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of changes in other provisions [abstract]
Balance	$ 827	$ 673
Liabilities incurred	24	30
Liabilities settled	(47)	(80)
Accretion	(49)	32
Acquisition of liabilities		2
Disposals	(5)
Revisions in estimated cash flows	100	179
Revisions in discount rates	(225)	(6)
Reversals	(9)	(3)
Change in foreign exchange rates	15
Balance	729	827
Decommissioning and restoration
Reconciliation of changes in other provisions [abstract]
Balance	793	608
Liabilities incurred	1	8
Liabilities settled	(35)	(18)
Accretion	(49)	32
Acquisition of liabilities		2
Disposals	(5)
Revisions in estimated cash flows	95	167
Revisions in discount rates	(225)	(6)
Reversals	0	0
Change in foreign exchange rates	15
Balance	688	793
Other provisions
Reconciliation of changes in other provisions [abstract]
Balance	34	65
Liabilities incurred	23	22
Liabilities settled	(12)	(62)
Accretion	0	0
Acquisition of liabilities		0
Disposals	0
Revisions in estimated cash flows	5	12
Revisions in discount rates	0	0
Reversals	(9)	(3)
Change in foreign exchange rates	0
Balance	$ 41	$ 34

X

- Definition

The increase in other provisions resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Other provisions]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 37
-IssueDate 2022-03-24
-Paragraph 84
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2022-en-r&anchor=para_84&doctype=Standard
-URIDate 2022-03-24

+ Details

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

X

- Definition

The decrease in property, plant and equipment resulting from disposals. [Refer: Property, plant and equipment]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 16
-IssueDate 2022-03-24
-Paragraph 73
-Subparagraph e
-Clause ii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=16&code=ifrs-tx-2022-en-r&anchor=para_73_e_ii&doctype=Standard
-URIDate 2022-03-24

+ Details

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

X

- Definition

The increase (decrease) in other provisions resulting from a change in discount rate. [Refer: Other provisions]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 37
-IssueDate 2022-03-24
-Paragraph 84
-Subparagraph e
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2022-en-r&anchor=para_84_e&doctype=Standard
-URIDate 2022-03-24

+ Details

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

X

- Definition

The increase (decrease) in other provisions resulting from foreign currency exchange rate changes on provisions measured in a currency different from the entity's presentation currency. [Refer: Other provisions]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 37
-IssueDate 2022-03-24
-Paragraph 84
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2022-en-r&anchor=para_84&doctype=Standard
-URIDate 2022-03-24

+ Details

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

X

- Definition

The amount recognised for new other provisions. [Refer: Other provisions]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 37
-IssueDate 2022-03-24
-Paragraph 84
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2022-en-r&anchor=para_84_b&doctype=Standard
-URIDate 2022-03-24

+ Details

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

X

- Definition

The amount of provisions other than provisions for employee benefits. [Refer: Provisions]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 37
-IssueDate 2022-03-24
-Paragraph 84
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2022-en-r&anchor=para_84_a&doctype=Standard
-URIDate 2022-03-24

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2022-03-24
-Paragraph 78
-Subparagraph d
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_78_d&doctype=Standard
-URIDate 2022-03-24

+ Details

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

X

- Definition

The amount used (ie incurred and charged against the provision) for other provisions. [Refer: Other provisions]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 37
-IssueDate 2022-03-24
-Paragraph 84
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2022-en-r&anchor=para_84_c&doctype=Standard
-URIDate 2022-03-24

+ Details

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

X

- References

No definition available.

+ Details

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

X

- Definition

The amount reversed for unused other provisions. [Refer: Other provisions]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 37
-IssueDate 2022-03-24
-Paragraph 84
-Subparagraph d
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=37&code=ifrs-tx-2022-en-r&anchor=para_84_d&doctype=Standard
-URIDate 2022-03-24

+ Details

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

X

- Definition

Increase (Decrease) Through Change In Estimated Cash Flows

+ References

No definition available.

+ Details

Name:	tac_IncreaseDecreaseThroughChangeInEstimatedCashFlows
Namespace Prefix:	tac_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Increase Through Adjustments Arising From Passage Of Time, Other Provisions, Net Of Receivable

+ References

No definition available.

+ Details

Name:	tac_IncreaseThroughAdjustmentsArisingFromPassageOfTimeOtherProvisionsNetOfReceivable
Namespace Prefix:	tac_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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

X

- Details

Name:	ifrs-full_ClassesOfProvisionsAxis=ifrs-full_MiscellaneousOtherProvisionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: