XML 202 R172.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Preferred Shares - Preferred Share Dividends Declared (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Series A |  |
Disclosure of classes of share capital [line items] |  |
Dividends declared | $ 7 | $ 9
Series B |  |
Disclosure of classes of share capital [line items] |  |
Dividends declared | $ 1 | $ 1
Dividend rate on preference shares, spread | 2.03% | 2.03%
Series C |  |
Disclosure of classes of share capital [line items] |  |
Dividends declared | $ 11 | $ 14
Series E |  |
Disclosure of classes of share capital [line items] |  |
Dividends declared | 12 | 15
Series G |  |
Disclosure of classes of share capital [line items] |  |
Dividends declared | 8 | 10
Preferred Shares |  |
Disclosure of classes of share capital [line items] |  |
Dividends declared | $ 39 | $ 49

X
- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with 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 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 2021-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_106_d&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_DividendsRecognisedAsDistributionsToOwnersOfParent
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Dividend Rate On Preference Shares, Spread + References No definition available. + Details
Name: | tac_DividendRateOnPreferenceSharesSpread
Namespace Prefix: | tac_
Data Type: | num:percentItemType
Balance Type: | na
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: |