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Credit Facilities, Long-Term Debt and Lease Liabilities - Credit facilities summarized (Details) - CAD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |
Cash drawings | $ 3,653 | $ 3,267
Cash collateral | 260 | 18
Committed |  |
Disclosure of detailed information about borrowings [line items] |  |
Facility size | 2,590 |
Outstanding letters of credit | 957 |
Cash drawings | 433 |
Available capacity | 1,200 |
Non-Committed |  |
Disclosure of detailed information about borrowings [line items] |  |
Facility size | 400 |
Outstanding letters of credit | 218 |
Cash drawings | 0 |
Available capacity | 182 |
TransAlta Renewables Inc. |  |
Disclosure of detailed information about borrowings [line items] |  |
Cash collateral | 304 |
Syndicated Credit Facility | Committed |  |
Disclosure of detailed information about borrowings [line items] |  |
Facility size | 1,250 |
Outstanding letters of credit | 738 |
Cash drawings | 0 |
Available capacity | 512 |
Syndicated Credit Facility | TransAlta Renewables Inc. | Committed |  |
Disclosure of detailed information about borrowings [line items] |  |
Facility size | 700 |
Outstanding letters of credit | 0 |
Cash drawings | 33 |
Available capacity | 667 |
TransAlta Corporation bilateral credit facilities | Committed |  |
Disclosure of detailed information about borrowings [line items] |  |
Facility size | 240 |
Outstanding letters of credit | 219 |
Cash drawings | 0 |
Available capacity | 21 |
TransAlta Corporation Term Facility |  |
Disclosure of detailed information about borrowings [line items] |  |
Cash drawings | 396 | $ 0
TransAlta Corporation 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 |
Demand Facility | Non-Committed |  |
Disclosure of detailed information about borrowings [line items] |  |
Facility size | 250 |
Outstanding letters of credit | 120 |
Cash drawings | 0 |
Available capacity | 130 |
Demand Facility | TransAlta Renewables Inc. | Non-Committed |  |
Disclosure of detailed information about borrowings [line items] |  |
Facility size | 150 |
Outstanding letters of credit | 98 |
Cash drawings | 0 |
Available capacity | $ 52 |

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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 2022-03-24 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_55&doctype=Standard -URIDate 2022-03-24 + 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 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 2022-03-24 -Paragraph 14 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2022-en-r&anchor=para_14_a&doctype=Standard -URIDate 2022-03-24 + Details
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- Definition Borrowings Available Capacity + References No definition available. + 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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- Details
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