XML 207 R179.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Joint Arrangements (Details) | 12 Months Ended
--- | ---
Dec. 31, 2018
Sheerness | Coal generation |
Disclosure of joint operations [line items] |
Proportion of ownership interest in joint operation | 50.00%
Genesee Unit 3 | Coal generation |
Disclosure of joint operations [line items] |
Proportion of ownership interest in joint operation | 50.00%
Keephills Unit 3 | Coal generation |
Disclosure of joint operations [line items] |
Proportion of ownership interest in joint operation | 50.00%
Goldfields Power | Gas generation |
Disclosure of joint operations [line items] |
Proportion of ownership interest in joint operation | 50.00%
Fort Saskatchewan | Gas generation |
Disclosure of joint operations [line items] |
Proportion of ownership interest in joint operation | 60.00%
Fortescue River Gas Pipeline | Gas generation |
Disclosure of joint operations [line items] |
Proportion of ownership interest in joint operation | 43.00%
McBride Lake | Wind Generation |
Disclosure of joint operations [line items] |
Proportion of ownership interest in joint operation | 50.00%
Soderglen | Wind Generation |
Disclosure of joint operations [line items] |
Proportion of ownership interest in joint operation | 50.00%
Pingston | Hydro |
Disclosure of joint operations [line items] |
Proportion of ownership interest in joint operation | 50.00%

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

X
- Definition The proportion of ownership interest in a joint operation attributable to the entity. [Refer: Joint operations [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2017-01-01 -Paragraph 21 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=12&date=2017-03-01&anchor=para_21_a_iv&doctype=Standard -URIDate 2017-03-09 + Details
Name: | ifrs-full_ProportionOfOwnershipInterestInJointOperation
Namespace Prefix: | ifrs-full_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | ifrs-full_JointOperationsAxis=tac_SheernessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=tac_CoalGenerationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_JointOperationsAxis=tac_GeneseeUnit3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_JointOperationsAxis=tac_KeephillsUnit3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_JointOperationsAxis=tac_GoldfieldsPowerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=tac_GasGenerationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_JointOperationsAxis=tac_FortSaskatchewanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_JointOperationsAxis=tac_FortescueRiverGasPipelineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_JointOperationsAxis=tac_McBrideLakeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=tac_WindGenerationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_JointOperationsAxis=tac_SoderglenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_JointOperationsAxis=tac_PingstonMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=tac_HydroGenerationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |