XML 223 R193.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Commitments and Contingencies - Commitments (Details) $ in Millions, $ in Millions | Dec. 31, 2021 CAD ($) | Jul. 30, 2015 USD ($)
--- | --- | ---
Disclosure of Commitments [Line Items] |  |
Coal supply and mining agreements1 | $ 339 |
Long-term service agreements | 289 |
Operating leases | 43 |
Growth | 1,217 |
TransAlta Energy Transition Bill | 12 | $ 55
Total | 2,675 |
Natural gas, transportation and other contracts |  |
Disclosure of Commitments [Line Items] |  |
Purchase obligations | 743 |
Transmission |  |
Disclosure of Commitments [Line Items] |  |
Purchase obligations | 32 |
2022 |  |
Disclosure of Commitments [Line Items] |  |
Coal supply and mining agreements1 | 76 |
Long-term service agreements | 89 |
Operating leases | 4 |
Growth | 941 |
TransAlta Energy Transition Bill | 6 |
Total | 1,172 |
2022 | Natural gas, transportation and other contracts |  |
Disclosure of Commitments [Line Items] |  |
Purchase obligations | 47 |
2022 | Transmission |  |
Disclosure of Commitments [Line Items] |  |
Purchase obligations | 9 |
2023 |  |
Disclosure of Commitments [Line Items] |  |
Coal supply and mining agreements1 | 98 |
Long-term service agreements | 46 |
Operating leases | 3 |
Growth | 276 |
TransAlta Energy Transition Bill | 6 |
Total | 492 |
2023 | Natural gas, transportation and other contracts |  |
Disclosure of Commitments [Line Items] |  |
Purchase obligations | 54 |
2023 | Transmission |  |
Disclosure of Commitments [Line Items] |  |
Purchase obligations | 9 |
2024 |  |
Disclosure of Commitments [Line Items] |  |
Coal supply and mining agreements1 | 90 |
Long-term service agreements | 43 |
Operating leases | 3 |
Growth | 0 |
TransAlta Energy Transition Bill | 0 |
Total | 187 |
2024 | Natural gas, transportation and other contracts |  |
Disclosure of Commitments [Line Items] |  |
Purchase obligations | 45 |
2024 | Transmission |  |
Disclosure of Commitments [Line Items] |  |
Purchase obligations | 6 |
2025 |  |
Disclosure of Commitments [Line Items] |  |
Coal supply and mining agreements1 | 75 |
Long-term service agreements | 32 |
Operating leases | 1 |
Growth | 0 |
TransAlta Energy Transition Bill | 0 |
Total | 158 |
2025 | Natural gas, transportation and other contracts |  |
Disclosure of Commitments [Line Items] |  |
Purchase obligations | 44 |
2025 | Transmission |  |
Disclosure of Commitments [Line Items] |  |
Purchase obligations | 6 |
2026 |  |
Disclosure of Commitments [Line Items] |  |
Coal supply and mining agreements1 | 0 |
Long-term service agreements | 25 |
Operating leases | 1 |
Growth | 0 |
TransAlta Energy Transition Bill | 0 |
Total | 73 |
2026 | Natural gas, transportation and other contracts |  |
Disclosure of Commitments [Line Items] |  |
Purchase obligations | 45 |
2026 | Transmission |  |
Disclosure of Commitments [Line Items] |  |
Purchase obligations | 2 |
2027 |  |
Disclosure of Commitments [Line Items] |  |
Coal supply and mining agreements1 | 0 |
Long-term service agreements | 54 |
Operating leases | 31 |
Growth | 0 |
TransAlta Energy Transition Bill | 0 |
Total | 593 |
2027 | Natural gas, transportation and other contracts |  |
Disclosure of Commitments [Line Items] |  |
Purchase obligations | 508 |
2027 | Transmission |  |
Disclosure of Commitments [Line Items] |  |
Purchase obligations | $ 0 |

X
- Definition The amount of capital commitments for which the entity has entered into a contract. [Refer: Capital commitments] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 112 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_112_c&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_ContractualCapitalCommitments
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of contractual undiscounted cash flows in relation to lease liabilities before deducting finance charges. [Refer: Lease liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2021-01-01 -Paragraph 58 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2021-en-r&anchor=para_58&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph B11D -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_B11D_a&doctype=Appendix&subtype=B -URIDate 2021-03-24 + Details
Name: | ifrs-full_GrossLeaseLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Coal Supply and Mining Obligation + References No definition available. + Details
Name: | tac_CoalSupplyandMiningObligation
Namespace Prefix: | tac_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Commitment for Energy Bill Initiatives + References No definition available. + Details
Name: | tac_CommitmentforEnergyBillInitiatives
Namespace Prefix: | tac_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Contractual Obligations1 + References No definition available. + Details
Name: | tac_ContractualObligations1
Namespace Prefix: | tac_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition [Line Items] for Disclosure of Commitments [Table] + References No definition available. + Details
Name: | tac_DisclosureofCommitmentsLineItems
Namespace Prefix: | tac_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Long-term Service Obligation + References No definition available. + Details
Name: | tac_LongtermServiceObligation
Namespace Prefix: | tac_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Purchase Obligations1 + References No definition available. + Details
Name: | tac_PurchaseObligations1
Namespace Prefix: | tac_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | tac_PurchaseObligationItemAxis=tac_NaturalGasTransportationandOtherProductsandServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | tac_PurchaseObligationItemAxis=tac_TransmissionNetworkCapacityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

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

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

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

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