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Business Acquisitions and Divestitures - Narrative (Details) $ in Millions, $ in Millions |  |  |  |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Nov. 05, 2021 CAD ($) MW | Nov. 05, 2021 USD ($) | Jun. 30, 2021 CAD ($) | Feb. 26, 2021 CAD ($) | May 19, 2020 USD ($) MW | Dec. 31, 2021 CAD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2019 CAD ($)
Investment [Line Items] |  |  |  |  |  |  |  |
Revenue of combined entity as if combination occurred at beginning of period |  |  |  |  |  | $ 16 |  |
Profit (loss) of combined entity as if combination occurred at beginning of period |  |  |  |  |  | 9 |  |
Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities |  |  |  |  |  | 120 | $ 32 | $ 117
Proceeds on sale of Pioneer Pipeline |  |  |  |  |  | 128 | 0 | 0
Gain on sale of assets and other (Note 4 and 18) |  |  |  |  |  | $ 54 | $ 9 | $ 46
TransAlta Renewables Inc. |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |
Consideration received |  |  |  | $ (213) |  |  |  |
North Carolina Solar |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |
Capacity of facility (in megawatts) | MW | 122,000,000 |  |  |  |  |  |  |
Cash transferred | $ 99 |  |  |  |  |  |  |
Remaining amortisation period of intangible assets material to entity | 12 years | 12 years |  |  |  |  |  |
Consideration received | $ 123 |  |  |  |  |  |  |
Percentage of voting equity interests acquired | 100.00% |  |  |  |  |  |  |
North Carolina Solar | Entities with joint control or significant influence over entity [member] |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |
Consideration received |  | $ 102 |  |  |  |  |  |
Pipeline |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |
Consideration received |  |  | $ 255 |  |  |  |  |
Proceeds on sale of Pioneer Pipeline |  |  | 128 |  |  |  |  |
Non-current assets or disposal groups classified as held for sale |  |  | 97 |  |  |  |  |
Gain on sale of assets and other (Note 4 and 18) |  |  | 31 |  |  |  |  |
Decrease through derecognition, financial assets |  |  | 41 |  |  |  |  |
Decrease through derecognition, financial liabilities |  |  | 43 |  |  |  |  |
Gains (losses) on available-for-sale financial assets |  |  | $ 2 |  |  |  |  |
Percentage of voting equity interests acquired |  |  | 50.00% |  |  |  |  |
Contracted Cogeneration Asset in Michigan |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |
Capacity of facility (in megawatts) | MW |  |  |  |  | 29 |  |  |
Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities |  |  |  |  | $ 27 |  |  |
Long-term PPA and steam sale agreement, term |  |  |  |  | 6 years |  |  |
North Carolina Solar | TransAlta Renewables Inc. |  |  |  |  |  |  |  |
Investment [Line Items] |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired | 100.00% |  |  |  |  |  |  |

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