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Credit Facilities, Long-Term Debt and Lease Liabilities - Credit Facilities (Details) - CAD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |  |  |
Cash and cash equivalents | $ 348 | $ 1,134 | $ 947 | $ 703
Non-Committed |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Outstanding letters of credit | 187 |  |  |
Committed syndicated bank facility | Committed credit facilities |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Undrawn borrowing capacity | 1,400 | $ 1,000 |  |
Committed |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Outstanding letters of credit | 595 |  |  |
Committed | TransAlta syndicated credit facility |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Outstanding letters of credit | 417 |  |  |
Committed | TransAlta syndicated credit facility | TransAlta Renewables Inc. |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |
Cash and cash equivalents | $ 345 |  |  |

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- Definition The amount of cash on hand and demand deposits, along with 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. [Refer: Cash; Cash equivalents] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2023-01-01 -Paragraph 45 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2023-en-r&anchor=para_45&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2023-01-01 -Paragraph B13 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2023-en-r&anchor=para_B13_a&doctype=Appendix&subtype=B -URIDate 2023-03-23 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 54 -Subparagraph i -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_54_i&doctype=Standard -URIDate 2023-03-23 + Details
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- 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
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- Definition Letters of Credit, Outstanding + References No definition available. + Details
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- Definition Line Of Credit Facility, Remaining Borrowing Capacity1 + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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- Details
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