XML 167 R137.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Intangible Assets (Details) - CAD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jun. 28, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Beginning balance |  | $ 373 | $ 364
Ending balance |  | 318 | 373
Gross carrying amount |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Beginning balance |  | 807 | 744
Additions |  | 14 | 53
Retirements and disposals(2) |  |  | (2)
Change in foreign exchange rates |  | (6) | 3
Transfers |  | 0 | 9
Assets transferred to right of use assets on implementation of IFRS 16 (Note 3 and 18) |  | (5) |
Acquisition |  | 16 |
Disposals |  | (38) |
Ending balance |  | 788 | 807
Accumulated amortization |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Beginning balance |  | 434 | 380
Retirements and disposals(2) |  |  | 1
Change in foreign exchange rates |  | (1) | 2
Transfers |  | 0 | 3
Assets transferred to right of use assets on implementation of IFRS 16 (Note 3 and 18) |  | (3) |
Disposals |  | (10) |
Amortization |  | 50 | 50
Ending balance |  | 470 | 434
Coal rights |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Beginning balance |  | 68 | 53
Ending balance |  | 32 | 68
Coal rights | Gross carrying amount |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Beginning balance |  | 185 | 178
Additions |  | 0 | 0
Retirements and disposals(2) |  |  | 0
Change in foreign exchange rates |  | 0 | 0
Transfers |  | 1 | 7
Assets transferred to right of use assets on implementation of IFRS 16 (Note 3 and 18) |  | 0 |
Acquisition |  | 0 |
Disposals |  | (37) |
Ending balance |  | 149 | 185
Coal rights | Accumulated amortization |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Beginning balance |  | 117 | 125
Retirements and disposals(2) |  |  | 0
Change in foreign exchange rates |  | 0 | 0
Transfers |  | 1 | (17)
Assets transferred to right of use assets on implementation of IFRS 16 (Note 3 and 18) |  | 0 |
Disposals |  | (9) |
Amortization |  | 8 | 9
Ending balance |  | 117 | 117
Software and other |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Beginning balance |  | 118 | 126
Ending balance |  | 132 | 118
Software and other | Gross carrying amount |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Beginning balance |  | 339 | 314
Additions |  | 0 | 0
Retirements and disposals(2) |  |  | (2)
Change in foreign exchange rates |  | (4) | 3
Transfers |  | 48 | 24
Assets transferred to right of use assets on implementation of IFRS 16 (Note 3 and 18) |  | (5) |
Acquisition |  | 1 |
Disposals |  | (1) |
Ending balance |  | 378 | 339
Software and other | Accumulated amortization |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Beginning balance |  | 221 | 188
Retirements and disposals(2) |  |  | 1
Change in foreign exchange rates |  | (1) | 2
Transfers |  | (1) | 0
Assets transferred to right of use assets on implementation of IFRS 16 (Note 3 and 18) |  | (3) |
Disposals |  | (1) |
Amortization |  | 31 | 32
Ending balance |  | 246 | 221
Power sale contracts |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Beginning balance |  | 141 | 156
Ending balance |  | 143 | 141
Power sale contracts | Gross carrying amount |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Beginning balance |  | 237 | 223
Additions |  | 0 | 0
Retirements and disposals(2) |  |  | 0
Change in foreign exchange rates |  | (1) | 0
Transfers |  | 14 | 14
Assets transferred to right of use assets on implementation of IFRS 16 (Note 3 and 18) |  | 0 |
Acquisition |  | 0 |
Disposals |  | 0 |
Ending balance |  | 250 | 237
Power sale contracts | Accumulated amortization |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Beginning balance |  | 96 | 67
Retirements and disposals(2) |  |  | 0
Change in foreign exchange rates |  | 0 | 0
Transfers |  | 0 | (20)
Assets transferred to right of use assets on implementation of IFRS 16 (Note 3 and 18) |  | 0 |
Disposals |  | 0 |
Amortization |  | 11 | 9
Ending balance |  | 107 | 96
Intangibles under development |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Beginning balance |  | 46 | 29
Ending balance |  | 11 | 46
Intangibles under development | Gross carrying amount |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Beginning balance |  | 46 | 29
Additions |  | 14 | 53
Retirements and disposals(2) |  |  | 0
Change in foreign exchange rates |  | (1) | 0
Transfers |  | 63 | (36)
Assets transferred to right of use assets on implementation of IFRS 16 (Note 3 and 18) |  | 0 |
Acquisition |  | 15 |
Disposals |  | 0 |
Ending balance |  | 11 | 46
Intangibles under development | Accumulated amortization |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Beginning balance |  | 0 | 0
Retirements and disposals(2) |  |  | 0
Change in foreign exchange rates |  | 0 | 0
Transfers |  | 0 | 0
Assets transferred to right of use assets on implementation of IFRS 16 (Note 3 and 18) |  | 0 |
Disposals |  | 0 |
Amortization |  | 0 | 0
Ending balance |  | 0 | $ 0
US Wind Projects - Big Level | Gross carrying amount |  |  |
Reconciliation of changes in intangible assets other than goodwill [abstract] |  |  |
Additions |  | $ 33 |
Lakeswind |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Impairment loss | $ 12 |  |
Lakeswind | Intangible assets |  |  |
Disclosure of reconciliation of changes in intangible assets and goodwill [line items] |  |  |
Impairment loss | $ 1 |  |

X
- Definition The increase in intangible assets other than goodwill resulting from acquisitions through business combinations. [Refer: Business combinations [member]; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2018-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_118_e_i&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_AcquisitionsThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of additions to intangible assets other than goodwill, other than those acquired through business combinations. [Refer: Business combinations [member]; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2018-01-01 -Paragraph 118 -Subparagraph e -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_118_e_i&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_AdditionsOtherThanThroughBusinessCombinationsIntangibleAssetsOtherThanGoodwill
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of amortisation of intangible assets other than goodwill. [Refer: Depreciation and amortisation expense; Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2018-01-01 -Paragraph 118 -Subparagraph e -Clause vi -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_118_e_vi&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_AmortisationIntangibleAssetsOtherThanGoodwill
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfReconciliationOfChangesInIntangibleAssetsAndGoodwillLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The decrease in intangible assets other than goodwill resulting from disposals. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2018-01-01 -Paragraph 118 -Subparagraph e -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_118_e_ii&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_DisposalsIntangibleAssetsOtherThanGoodwill
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount recognised as a reduction of the carrying amount of an asset or cash-generating unit to its recoverable amount. [Refer: Carrying amount [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2018-01-01 -Paragraph 130 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_130_b&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 36 -IssueDate 2018-01-01 -Paragraph 130 -Subparagraph d -Clause ii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=36&date=2018-03-01&anchor=para_130_d_ii&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_ImpairmentLoss
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The increase (decrease) in intangible assets other than goodwill resulting from net exchange differences arising on the translation of the financial statements from the functional currency into a different presentation currency, including the translation of a foreign operation into the presentation currency of the reporting entity. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2018-01-01 -Paragraph 118 -Subparagraph e -Clause vii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_118_e_vii&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_IncreaseDecreaseThroughNetExchangeDifferencesIntangibleAssetsOtherThanGoodwill
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The increase (decrease) in intangible assets other than goodwill resulting from transfers. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2018-01-01 -Paragraph 118 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_118_e&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_IncreaseDecreaseThroughTransfersIntangibleAssetsOtherThanGoodwill
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of identifiable non-monetary assets without physical substance. This amount does not include goodwill. [Refer: Goodwill] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 38 -IssueDate 2018-01-01 -Paragraph 118 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_118_e&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 54 -Subparagraph c -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_54_c&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_IntangibleAssetsOtherThanGoodwill
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | ifrs-full_ReconciliationOfChangesInIntangibleAssetsOtherThanGoodwillAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The decrease in intangible assets other than goodwill resulting from retirements. [Refer: Intangible assets other than goodwill] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 38 -IssueDate 2018-01-01 -Paragraph 118 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_118_e&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_RetirementsIntangibleAssetsOtherThanGoodwill
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Assets Transferred To Right-Of-Use Assets + References No definition available. + Details
Name: | tac_AssetsTransferredToRightOfUseAssets
Namespace Prefix: | tac_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Details
Name: | ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis=ifrs-full_GrossCarryingAmountMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CarryingAmountAccumulatedDepreciationAmortisationAndImpairmentAndGrossCarryingAmountAxis=ifrs-full_AccumulatedDepreciationAndAmortisationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=ifrs-full_MiningRightsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=ifrs-full_ComputerSoftwareMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=ifrs-full_OtherIntangibleAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfIntangibleAssetsOtherThanGoodwillAxis=ifrs-full_IntangibleAssetsUnderDevelopmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=tac_USWindProjectsBigLevelMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_TypesOfInvestmentPropertyAxis=tac_LakeswindMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfPropertyPlantAndEquipmentAxis=ifrs-full_OtherPropertyPlantAndEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |