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Related Party Transactions Disclosure of interests in subsidiaries (Details) $ in Millions, $ in Millions |  | 12 Months Ended |
--- | --- | --- | ---
Feb. 26, 2021 CAD ($) | Dec. 31, 2021 CAD ($) | Dec. 31, 2019 | Dec. 31, 2021 USD ($)
Disclosure of subsidiaries [line items] |  |  |  |
Receivables due from associates |  | $ (18) |  | $ (14)
TransAlta Renewables Inc. |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Ownership interest (as a percent) |  | 60.10% | 60.40% |
Consideration received | $ 213 |  |  |
Canada | TransAlta Generation Partnership |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Ownership interest (as a percent) |  | 100.00% |  |
Canada | TransAlta Cogeneration, L.P. |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Ownership interest (as a percent) |  | 50.01% |  |
Canada | TransAlta Energy Marketing Corp. |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Ownership interest (as a percent) |  | 100.00% |  |
Canada | TransAlta Renewables Inc. |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Ownership interest (as a percent) |  | 60.10% |  |
US | SP Skookumchuck Investment, LLC |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Proportion of ownership interest in joint venture |  | 49.00% |  |
US | EMG International, LLC |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Proportion of ownership interest in joint venture |  | 30.00% |  |
US | TransAlta Centralia Generation, LLC |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Ownership interest (as a percent) |  | 100.00% |  |
US | TransAlta Energy Marketing (U.S.), Inc. |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Ownership interest (as a percent) |  | 100.00% |  |
Australia | TransAlta Energy (Australia), Pty Ltd. |  |  |  |
Disclosure of subsidiaries [line items] |  |  |  |
Ownership interest (as a percent) |  | 100.00% |  |

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- Definition The amount of consideration paid or received in respect of both obtaining and losing control of subsidiaries or other businesses. [Refer: Subsidiaries [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 7 -IssueDate 2021-01-01 -Paragraph 40 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=7&code=ifrs-tx-2021-en-r&anchor=para_40_a&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The proportion of ownership interest in a joint venture attributable to the entity. [Refer: Joint ventures [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2021-01-01 -Paragraph 17 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=27&code=ifrs-tx-2021-en-r&anchor=para_17_b_iii&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 27 -IssueDate 2021-01-01 -Paragraph 16 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=27&code=ifrs-tx-2021-en-r&anchor=para_16_b_iii&doctype=Standard -URIDate 2021-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2021-01-01 -Paragraph 21 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2021-en-r&anchor=para_21_a_iv&doctype=Standard -URIDate 2021-03-24 + Details
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