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Credit Facilities, Long-Term Debt and Lease Liabilities - Credit facilities summarized (Details) - CAD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |
Cash drawings | $ 3,466 | $ 3,653
Cash collateral | 9 | 260
Committed |  |
Disclosure of detailed information about borrowings [line items] |  |
Facility size | 2,590 |
Outstanding letters of credit | 595 |
Cash drawings | 400 |
Available capacity | 1,595 |
Non-Committed |  |
Disclosure of detailed information about borrowings [line items] |  |
Facility size | 400 |
Outstanding letters of credit | 187 |
Cash drawings | 0 |
Available capacity | 213 |
TransAlta Renewables Inc. |  |
Disclosure of detailed information about borrowings [line items] |  |
Cash collateral | 145 |
TransAlta syndicated credit facility | Committed |  |
Disclosure of detailed information about borrowings [line items] |  |
Facility size | 1,950 |
Outstanding letters of credit | 417 |
Cash drawings | 0 |
Available capacity | 1,533 |
TransAlta bilateral credit facilities | Committed |  |
Disclosure of detailed information about borrowings [line items] |  |
Facility size | 240 |
Outstanding letters of credit | 178 |
Cash drawings | 0 |
Available capacity | 62 |
TransAlta Term Facility |  |
Disclosure of detailed information about borrowings [line items] |  |
Cash drawings | 397 | $ 396
TransAlta Term Facility | Committed |  |
Disclosure of detailed information about borrowings [line items] |  |
Facility size | 400 |
Outstanding letters of credit | 0 |
Cash drawings | 400 |
Available capacity | 0 |
TransAlta demand facilities | Non-Committed |  |
Disclosure of detailed information about borrowings [line items] |  |
Facility size | 400 |
Outstanding letters of credit | 187 |
Cash drawings | 0 |
Available capacity | $ 213 |

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- Definition The amount of outstanding funds that the entity is obligated to repay. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_55&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition The amount of financial assets that the entity has pledged as collateral for liabilities or contingent liabilities, including amounts that have been reclassified in accordance with paragraph 3.2.23(a) of IFRS 9. [Refer: Contingent liabilities [member]; Financial assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2023-01-01 -Paragraph 14 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2023-en-r&anchor=para_14_a&doctype=Standard -URIDate 2023-03-23 + Details
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- Definition Facility Size + References No definition available. + Details
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Balance Type: | credit
Period Type: | instant

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- Definition Letters of Credit, Outstanding + References No definition available. + Details
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Balance Type: | credit
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- Details
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- Details
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- Details
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