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Consolidated Statements of Earnings (Loss) - CAD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Profit or loss [abstract]      
Revenue $ 3,355 $ 2,976 $ 2,721
Fuel and purchased power 1,060 1,263 1,054
Carbon compliance 112 78 178
Gross margin 2,183 1,635 1,489
Operations, maintenance, and administration 539 521 511
Depreciation and amortization 621 599 529
Asset impairment charges (reversals) (48) 9 648
Taxes, other than income taxes 29 33 32
Net other operating (income) loss (47) (58) 8
Operating income (loss) 1,089 531 (239)
Equity income (loss) 4 9 9
Finance lease income 12 19 25
Interest income 59 24 11
Net interest expense (281) (286) (256)
Foreign exchange gain (loss) (7) 4 16
Gain on sale of assets and other 4 52 54
Earnings (loss) before income taxes 880 353 (380)
Income tax expense (recovery) 84 192 45
Net earnings (loss) 796 161 (425)
Net earnings (loss) attributable to:      
TransAlta shareholders 695 50 (537)
Non-controlling interests 101 111 112
Net earnings (loss) 796 161 (425)
Preferred share dividends 51 46 39
Net earnings (loss) attributable to common shareholders $ 644 $ 4 $ (576)
Weighted average number of common shares outstanding in the year (in shares) 276 271 271
Net earnings (loss) per share attributable to common shareholders, basic (in CAD per share) $ 2.33 $ 0.01 $ (2.13)
Net earnings (loss) per share attributable to common shareholders, diluted (in CAD per share) $ 2.33 $ 0.01 $ (2.13)