XML 159 R129.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Risk Management Activities - Maximum exposure to credit risk (Details) - CAD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | $ 37 | $ 22
Credit risk |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | 1,543 |
Credit risk | Trade and other receivables |  |
Disclosure of credit risk exposure [line items] |  |
Maximum exposure to credit risk | $ 651 |
Trade and other receivables | Credit risk |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk, allocation percentage | 100.00% |
Trade and other receivables | Investment Grade | Credit risk |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk, allocation percentage | 89.00% |
Trade and other receivables | Non-Investment Grade | Credit risk |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk, allocation percentage | 11.00% |
Long-term portion of finance lease receivable | Credit risk |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk, allocation percentage | 100.00% |
Maximum exposure to credit risk | $ 185 |
Long-term portion of finance lease receivable | Investment Grade | Credit risk |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk, allocation percentage | 100.00% |
Long-term portion of finance lease receivable | Non-Investment Grade | Credit risk |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk, allocation percentage | 0.00% |
Risk management assets | Credit risk |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk, allocation percentage | 100.00% |
Maximum exposure to credit risk | $ 707 |
Risk management assets | Investment Grade | Credit risk |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk, allocation percentage | 86.00% |
Risk management assets | Non-Investment Grade | Credit risk |  |
Disclosure of credit risk exposure [line items] |  |
Credit risk, allocation percentage | 14.00% |

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

X
- Definition The amount that best represents the maximum exposure to credit risk without taking into account any collateral held or other credit enhancements (for example, netting agreements that do not qualify for offset in accordance with IAS 32). [Refer: Credit risk [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35K -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35K_a&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Expiry date 2023-01-01 -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 36 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_36_a&doctype=Standard&book=b -URIDate 2021-03-24 + Details
Name: | ifrs-full_MaximumExposureToCreditRisk
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

X
- Definition Credit Risk, Allocation Percentage + References No definition available. + Details
Name: | tac_CreditRiskAllocationPercentage
Namespace Prefix: | tac_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | ifrs-full_TypesOfRisksAxis=ifrs-full_CreditRiskMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=tac_TradeAndOtherReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=tac_TradeAndOtherReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ExternalCreditGradesAxis=tac_InvestmentGradeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ExternalCreditGradesAxis=tac_NonInvestmentGradeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=tac_LongtermPortionOfFinanceLeaseReceivablesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialInstrumentsAxis=tac_RiskManagementAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |