XML 145 R115.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Financial Instruments - Carrying amounts and classifications of financial assets and liabilities (Details) - CAD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Disclosure of detailed information about financial instruments [line items] |  |
Cash equivalents | $ 0 | $ 0
Financial liabilities | 3,267 | 3,361
Accounts payable and accrued liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | 689 | 599
Accounts payable and accrued liabilities | Amortized cost |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | 689 | 599
Dividends payable |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | 62 | 59
Dividends payable | Amortized cost |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | 62 | 59
Credit facilities, long-term debt and lease liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | 3,267 | 3,361
Credit facilities, long-term debt and lease liabilities | Amortized cost |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | 3,267 | 3,361
Exchangeable securities (Note 25) |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | 735 | 730
Exchangeable securities (Note 25) | Amortized cost |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | 735 | 730
Within one year | Risk management liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | 261 | 94
Within one year | Derivatives | Risk management liabilities | Hedging Liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | 0 | 10
Within one year | Derivatives | Risk management liabilities | Trading securities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | 261 | 84
Later than one year | Risk management liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | 145 | 68
Later than one year | Derivatives | Risk management liabilities | Hedging Liabilities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | 0 | 0
Later than one year | Derivatives | Risk management liabilities | Trading securities |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial liabilities | 145 | 68
Cash and cash equivalents |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 947 | 703
Cash and cash equivalents | Amortized cost |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 947 | 703
Restricted cash |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 70 | 71
Restricted cash | Amortized cost |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 70 | 71
Trade and other receivables |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 651 | 583
Trade and other receivables | Amortized cost |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 651 | 583
Long-term portion of finance lease receivable |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 185 | 228
Long-term portion of finance lease receivable | Amortized cost |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 185 | 228
Risk management assets | Within one year |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 308 | 171
Risk management assets | Later than one year |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 399 | 521
Risk management assets | Hedging Asset | Within one year | Derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 36 | 102
Risk management assets | Hedging Asset | Later than one year | Derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 252 | 471
Risk management assets | Trading securities | Within one year | Derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | 272 | 69
Risk management assets | Trading securities | Later than one year | Derivatives |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets | $ 147 | 50
Other assets |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets |  | 52
Other assets | Amortized cost |  |
Disclosure of detailed information about financial instruments [line items] |  |
Financial assets |  | $ 52

X
- Definition The amount of short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 45 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_45&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_CashEquivalents
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_25&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35H&doctype=Standard -URIDate 2021-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35I&doctype=Standard -URIDate 2021-03-24 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35M&doctype=Standard -URIDate 2021-03-24 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_35N&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_FinancialAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2021-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_25&doctype=Standard -URIDate 2021-03-24 + Details
Name: | ifrs-full_FinancialLiabilities
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | ifrs-full_ClassesOfFinancialLiabilitiesAxis=tac_AccountsPayableAndAccruedLiabilities1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfFinancialLiabilitiesAxis=ifrs-full_FinancialLiabilitiesAtAmortisedCostCategoryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialLiabilitiesAxis=tac_DividendsPayable1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialLiabilitiesAxis=tac_CreditFacilitiesLongtermDebtAndFinanceLeaseObligations1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialLiabilitiesAxis=tac_ExchangeableSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_NotLaterThanOneYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialLiabilitiesAxis=tac_RiskManagementLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | ifrs-full_CategoriesOfFinancialLiabilitiesAxis=tac_HedgingLiabilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfFinancialLiabilitiesAxis=ifrs-full_TradingSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_LaterThanOneYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_ClassesOfFinancialAssetsAxis=tac_CashAndCashEquivalents1Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfFinancialAssetsAxis=ifrs-full_FinancialAssetsAtAmortisedCostCategoryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | ifrs-full_CategoriesOfFinancialAssetsAxis=tac_HedgingAssetMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CategoriesOfFinancialAssetsAxis=ifrs-full_TradingSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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