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Capital - Disclosure of Components of Capital (Details) - CAD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Disclosure of components of capital [Line Items] |  |  |  |
Long-term debt |  | $ 3,466 | $ 3,653 |
Increase (decrease) in long-term debt |  | (187) |  |
Exchangeable securities |  | 744 | 739 |
Increase (decrease) in exchangeable securities |  | 5 |  |
Bank overdraft |  | 3 | 16 |
Increase (decrease) in bank overdrafts |  | (13) |  |
Equity |  | 1,664 | 1,989 | $ 2,593
Less: available cash and cash equivalents(2) |  | (348) | (1,134) |
Increase (decrease) in available cash and cash equivalents |  | 786 |  |
Less: principal portion of restricted cash on TransAlta OCP bonds |  | (69) | (70) |
Less: fair value liability (asset) of hedging instruments on long-term debt |  | 5 |  |
Less: fair value asset of hedging instruments on long-term debt |  |  | (3) |
Increase (decrease) in fair value asset of hedging instruments on long-term debt |  | 8 |  |
Total capital |  | 5,517 | 5,243 |
Increase (decrease) in total capital |  | 274 |  |
Common shares |  |  |  |
Disclosure of components of capital [Line Items] |  |  |  |
Equity |  | 3,285 | 2,863 |
Increase (decrease) in equity |  | 422 |  |
Preferred shares |  |  |  |
Disclosure of components of capital [Line Items] |  |  |  |
Equity |  | 942 | 942 |
Increase (decrease) in equity |  | 0 |  |
Contributed surplus |  |  |  |
Disclosure of components of capital [Line Items] |  |  |  |
Equity |  | 41 | 41 | 46
Increase (decrease) in equity |  | 0 |  |
Deficit |  |  |  |
Disclosure of components of capital [Line Items] |  |  |  |
Equity |  | (2,567) | (2,514) | (2,453)
Increase (decrease) in equity |  | (53) |  |
Accumulated other comprehensive income (loss) |  |  |  |
Disclosure of components of capital [Line Items] |  |  |  |
Equity | [1] | (164) | (222) | 146
Increase (decrease) in equity |  | 58 |  |
Non-controlling interests |  |  |  |
Disclosure of components of capital [Line Items] |  |  |  |
Equity |  | 127 | 879 | $ 1,011
Increase (decrease) in equity |  | (752) |  |
TransAlta OCP |  |  |  |
Disclosure of components of capital [Line Items] |  |  |  |
Less: principal portion of restricted cash on TransAlta OCP bonds |  | (17) | $ (17) |
Increase (decrease) in principal portion of restricted cash on TransAlta OCP bonds |  | $ 0 |  |
[1] | (1)Refer to Note 29 for details on components of and changes in, accumulated other comprehensive income (loss).

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