XML 201 R168.htm IDEA: XBRL DOCUMENT
v3.24.0.1

Employee Future Benefits - Narrative (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2023 age | Dec. 31, 2023 | Dec. 31, 2023 Rate | Mar. 31, 2023 CAD ($)
Disclosure of defined benefit plans [line items] |  |  |  |  |
Weighted average duration of defined benefit obligation | 10 years 4 months 24 days |  |  |  |
Minimum |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Employer contribution (as percent) |  |  | 500.00% |  |
Maximum |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Employer contribution (as percent) |  |  | 1100.00% |  |
Registered | Letter of credit |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Letter of credit, posted |  |  |  |  | $ 88
Registered | Surety Bonds |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Letter of credit, posted |  |  |  |  | $ 70
Other |  |  |  |  |
Disclosure of defined benefit plans [line items] |  |  |  |  |
Maximum age disabled and retired members eligible for benefits |  | 65 |  | 65 |

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

X
- Definition The amount of the exposure to credit risk on loan commitments and financial guarantee contracts. [Refer: Loan commitments [member]; Financial guarantee contracts [member]; Credit risk [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 35H -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_35H&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 35M -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_35M&doctype=Standard -URIDate 2023-03-23 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 35I -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_35I&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_ExposureToCreditRiskOnLoanCommitmentsAndFinancialGuaranteeContracts
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The weighted average duration of a defined benefit obligation. [Refer: Weighted average [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 19 -IssueDate 2023-01-01 -Paragraph 147 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=19&code=ifrs-tx-2023-en-r&anchor=para_147_c&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_WeightedAverageDurationOfDefinedBenefitObligation2019
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Benefit Plan, Maximum Age Disabled and Retired Member Eligible For Benefits + References No definition available. + Details
Name: | tac_DefinedBenefitPlanMaximumAgeDisabledAndRetiredMemberEligibleForBenefits
Namespace Prefix: | tac_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent1 + References No definition available. + Details
Name: | tac_DefinedContributionPlanMaximumAnnualContributionsPerEmployeePercent1
Namespace Prefix: | tac_
Data Type: | dtr-types1:percentItemType
Balance Type: | na
Period Type: | duration

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

X
- Details
Name: | ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CharacteristicsOfDefinedBenefitPlansAxis=tac_RegisteredPensionPlanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=tac_LetterofCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_BorrowingsByNameAxis=tac_SuretyBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CharacteristicsOfDefinedBenefitPlansAxis=tac_OtherPostEmploymentBenefitPlansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |