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Significant Events - Alberta Sundance Power Purchase Arrangements (Details) - Power Purchase Arrangement CAD in Millions | Dec. 31, 2017 CAD
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Disclosure of disaggregation of revenue from contracts with customers [line items] |
Expected compensation, termination of contractual arrangement | CAD 215
Balancing Pool compensation estimate, termination of contractual arrangement | CAD 157

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

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- Definition Counterparty Compensation Estimate, Termination of Contractual Arrangement + References No definition available. + Details
Name: | tac_CounterpartyCompensationEstimateTerminationofContractualArrangement
Namespace Prefix: | tac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Expected Compensation, Termination of Contractual Arrangement + References No definition available. + Details
Name: | tac_ExpectedCompensationTerminationofContractualArrangement
Namespace Prefix: | tac_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | ifrs-full_TypesOfContractsAxis=tac_PowerPurchaseArrangementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |