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Significant Events - Alberta Sundance Power Purchase Arrangements (Details) - Power Purchase Arrangement CAD in Millions	Dec. 31, 2017 CAD
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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- 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

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Namespace Prefix:
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Balance Type:
Period Type: