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Credit Facilities, Long-Term Debt and Lease Liabilities - Credit facilities summarized (Details) - CAD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Disclosure of detailed information about borrowings [line items] |  |
Facility size | $ 2,190 |
Outstanding letters of credit | 902 |
Borrowings | 3,267 | $ 3,361
Available capacity | 1,288 | 1,500
Financial assets pledged as collateral for liabilities or contingent liabilities | 18 | 0
TransAlta Renewables Inc. |  |
Disclosure of detailed information about borrowings [line items] |  |
Financial assets pledged as collateral for liabilities or contingent liabilities | 55 |
Revolving committed syndicated bank facility |  |
Disclosure of detailed information about borrowings [line items] |  |
Facility size | 1,250 |
Outstanding letters of credit | 618 |
Borrowings | 0 |
Available capacity | 632 |
Canadian committed bilateral credit facilities |  |
Disclosure of detailed information about borrowings [line items] |  |
Facility size | 240 |
Outstanding letters of credit | 186 |
Borrowings | 0 |
Available capacity | 54 |
Committed Credit Facility | TransAlta Renewables Inc. |  |
Disclosure of detailed information about borrowings [line items] |  |
Facility size | 700 |
Outstanding letters of credit | 98 |
Borrowings | 0 |
Available capacity | 602 |
Credit facilities |  |
Disclosure of detailed information about borrowings [line items] |  |
Borrowings | $ 0 | $ 114

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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 2021-01-01 -Paragraph 55 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_55&doctype=Standard -URIDate 2021-03-24 + Details
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Balance Type: | credit
Period Type: | instant

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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 2021-01-01 -Paragraph 14 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_14_a&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition Borrowings Available Capacity + References No definition available. + Details
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Namespace Prefix: | tac_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Facility Size + References No definition available. + Details
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Namespace Prefix: | tac_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Letters of Credit, Outstanding + References No definition available. + Details
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Namespace Prefix: | tac_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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- Details
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- Details
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Balance Type: |
Period Type: |

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- Details
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Balance Type: |
Period Type: |