XML 154 R124.htm IDEA: XBRL DOCUMENT
v3.25.0.1

Risk Management Activities - Non-Hedges (Details) $ in Millions, $ in Millions, $ in Millions | Dec. 31, 2024 AUD ($) | Dec. 31, 2024 CAD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 AUD ($) | Dec. 31, 2023 CAD ($) | Dec. 31, 2023 USD ($)
--- | --- | --- | --- | --- | --- | ---
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Fair value liability |  | $ 7 |  |  |  |
Fair value asset |  |  |  |  | $ 5 |
Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2024-2027, Contract One |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Fair value liability |  | (1) |  |  |  |
Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2024-2027, Contract Two |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Fair value asset |  | (13) |  |  |  |
Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2023-2026 |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Fair value liability |  |  |  |  | (1) |
Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2023-2025, Contract Two |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Fair value liability |  |  |  |  | 19 |
Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2024 |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Fair value asset |  | (9) |  |  |  |
Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2023 |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Fair value asset |  |  |  |  | 5 |
Foreign exchange forward contracts – foreign-denominated debt | Discontinued Hedge Positions | Currency risk | Maturity, 2024 |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Fair value liability |  | 8 |  |  |  |
Foreign exchange forward contracts – foreign-denominated debt | Discontinued Hedge Positions | Currency risk | Maturity, 2023 |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Fair value asset |  |  |  |  | (4) |
AUD | Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2024-2027, Contract One |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount sold | $ 14 |  |  |  |  |
AUD | Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2023-2026 |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount sold |  |  |  | $ 125 |  |
AUD | Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2024 |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount purchased | $ 153 |  |  |  |  |
AUD | Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2023 |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount purchased |  |  |  | $ 152 |  |
Canada, Dollars | Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2024-2027, Contract One |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount purchased |  | 10 |  |  |  |
Canada, Dollars | Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2024-2027, Contract Two |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount purchased |  | 585 |  |  |  |
Canada, Dollars | Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2023-2026 |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount purchased |  |  |  |  | 113 |
Canada, Dollars | Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2023-2025, Contract Two |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount purchased |  |  |  |  | 1,113 |
Canada, Dollars | Foreign exchange forward contracts – foreign-denominated debt | Discontinued Hedge Positions | Currency risk | Maturity, 2024 |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount sold |  | $ 192 |  |  |  |
Canada, Dollars | Foreign exchange forward contracts – foreign-denominated debt | Discontinued Hedge Positions | Currency risk | Maturity, 2023 |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount sold |  |  |  |  | $ 190 |
USD | Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2024-2027, Contract Two |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount sold |  |  | $ 419 |  |  |
USD | Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2023-2025, Contract Two |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount sold |  |  |  |  |  | $ 828
USD | Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2024 |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount sold |  |  | 101 |  |  |
USD | Foreign exchange forward contracts – foreign-denominated receipts/expenditures | Discontinued Hedge Positions | Currency risk | Maturity, 2023 |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount sold |  |  |  |  |  | 100
USD | Foreign exchange forward contracts – foreign-denominated debt | Discontinued Hedge Positions | Currency risk | Maturity, 2024 |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount purchased |  |  | $ 140 |  |  |
USD | Foreign exchange forward contracts – foreign-denominated debt | Discontinued Hedge Positions | Currency risk | Maturity, 2023 |  |  |  |  |  |
Disclosure of detailed information about hedges [line items] |  |  |  |  |  |
Notional amount purchased |  |  |  |  |  | $ 140

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

X
- Definition The amount of a hedging instrument, recognised as an asset. [Refer: Hedging instruments [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24A -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24A_a&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_HedgingInstrumentAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of a hedging instrument, recognised as a liability. [Refer: Hedging instruments [domain]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2024-01-01 -Paragraph 24A -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_24A_a&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_HedgingInstrumentLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Derivative, Notional Amount Purchased + References No definition available. + Details
Name: | tac_DerivativeNotionalAmountPurchased
Namespace Prefix: | tac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Derivative, Notional Amount Sold + References No definition available. + Details
Name: | tac_DerivativeNotionalAmountSold
Namespace Prefix: | tac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | ifrs-full_HedgingInstrumentsAxis=tac_ForeignExchangeForwardContractsForeignDenominatedReceiptsExpendituresMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfHedgesAxis=tac_DiscontinuedHedgePositionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfRisksAxis=ifrs-full_CurrencyRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=tac_Maturity20242027ContractOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=tac_Maturity20242027ContractTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=tac_Maturity20232026ContractOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=tac_Maturity20232025ContractTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=tac_Maturity2024Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=tac_Maturity2023Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_HedgingInstrumentsAxis=tac_ForeignExchangeForwardContractsForeignDenominatedDebtMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_AUD
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_CAD
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_CurrencyAxis=currency_USD
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |