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Non-Controlling Interests - Earnings of Subsidiaries with Non-Controlling Interests (Details) - CAD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2023
Oct. 04, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of subsidiaries [line items]          
Revenue     $ 3,355 $ 2,976 $ 2,721
Net earnings (loss)     796 161 (425)
Total comprehensive income (loss)     893 (263) (610)
Amounts attributable to the non-controlling interests:          
Net earnings (loss)     101 111 112
Total comprehensive income (loss)     76 55 83
TransAlta Cogeneration, L.P.          
Disclosure of subsidiaries [line items]          
Revenue     290 347 265
Net earnings (loss)     121 143 103
Total comprehensive income (loss)     121 143 103
Amounts attributable to the non-controlling interests:          
Net earnings (loss)     80 91 62
Total comprehensive income (loss)     80 91 62
Dividends paid to non-controlling interests     $ 148 87 56
Kent Hills Wind L.P.          
Disclosure of subsidiaries [line items]          
Revenue $ 7        
Net earnings (loss) 2        
Total comprehensive income (loss) 2        
Amounts attributable to the non-controlling interests:          
Net earnings (loss) 0        
Total comprehensive income (loss) $ 0        
TransAlta Renewables, Inc. Including Kent Hills Wind LP          
Disclosure of subsidiaries [line items]          
Revenue   $ 303   560 470
Net earnings (loss)   56   74 139
Total comprehensive income (loss)   (7)   (67) 66
Amounts attributable to the non-controlling interests:          
Net earnings (loss)   21   20 50
Total comprehensive income (loss)   (4)   (36) 21
Dividends paid to non-controlling interests   $ 75   $ 100 $ 100