XML 167 R139.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Decommissioning and Other Provisions - Other Provisions (Details) - CAD CAD in Millions |  | 12 Months Ended
--- | --- | ---
Nov. 18, 2016 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure of other provisions [line items] |  |  |
Reversal of unused provision |  | CAD (4) | CAD (96)
Keephills 1 |  |  |
Disclosure of other provisions [line items] |  |  |
Reversal of unused provision | CAD 94 |  |

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

X
- Definition The amount reversed for unused other provisions. [Refer: Other provisions] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 37 -IssueDate 2017-01-01 -Paragraph 84 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=37&date=2017-03-01&anchor=para_84_d&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_UnusedProvisionReversedOtherProvisions
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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