XML 188 R160.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Preferred Shares - Preferred Share Dividends Declared (Details) - CAD CAD / shares in Units, CAD in Millions |  |  | 12 Months Ended
--- | --- | --- | ---
Feb. 02, 2018 | Oct. 17, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of classes of share capital [line items] |  |  |  |  |
Dividends declared per share |  | CAD 0.04 |  |  |
Series A |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Dividends declared |  |  | CAD 5 | CAD 10 | CAD 14
Dividends declared per share | CAD 0.16931 |  |  |  |
Series B |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Dividends declared |  |  | 1 | 1 | 0
Dividends declared per share | 0.17889 |  |  |  |
Series C |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Dividends declared |  |  | 9 | 16 | 13
Dividends declared per share | 0.25169 |  |  |  |
Series E |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Dividends declared |  |  | 8 | 14 | 11
Dividends declared per share | 0.32463 |  |  |  |
Series G |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Dividends declared |  |  | 7 | 11 | 8
Dividends declared per share | CAD 0.33125 |  |  |  |
Preferred Shares |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Dividends declared |  |  | CAD 30 | CAD 52 | CAD 46

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

X
- Definition The amount, per share, of dividends proposed or declared before financial statements were authorised for issue but not recognised as distribution to owners. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 137 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_137_a&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_DividendsProposedOrDeclaredBeforeFinancialStatementsAuthorisedForIssueButNotRecognisedAsDistributionToOwnersPerShare
Namespace Prefix: | ifrs-full_
Data Type: | num:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of dividends recognised as distributions to owners of the parent. [Refer: Parent [member]] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2017-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2017-03-01&anchor=para_106_d&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_DividendsRecognisedAsDistributionsToOwnersOfParent
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=tac_PreferenceSharesSeriesAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=tac_PreferenceSharesSeriesBMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=tac_PreferenceSharesSeriesCMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=tac_PreferenceSharesSeriesEMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=tac_PreferenceSharesSeriesGMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfShareCapitalAxis=ifrs-full_PreferenceSharesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |