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Accumulated Other Comprehensive Loss (Details) - CAD ($)
$ in Millions
 12 Months Ended
Oct. 05, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Components and changes in accumulated other comprehensive Income (loss)        
Accumulated other comprehensive income, beginning of the period   $ (164)    
Currency translation adjustment        
Gains (losses) on translating net assets of foreign operations, net of reclassifications to net earnings, net of tax   (2) $ (3)  
Gains (losses) on financial instruments designated as hedges of foreign operations, net of reclassifications to net earnings, net of tax [1]   (28) 9 $ (25)
Cash flow hedges        
Gains (losses) on derivatives designated as cash flow hedges, net of reclassifications to net earnings and to non-financial assets, net of tax [2]   213 41 (556)
Other        
Intercompany and third-party investments at FVTOCI     0  
Accumulated other comprehensive income, end of the period   41 (164)  
Net income tax expense (recovery) relating to gains (losses) on financial instruments   (4) 1 3
Net impact related to cash flow hedges   53 27 (112)
Net of income tax expense   3 (1) 12
Currency translation adjustment        
Components and changes in accumulated other comprehensive Income (loss)        
Accumulated other comprehensive income, beginning of the period   (36) (39)  
Currency translation adjustment        
Gains (losses) on translating net assets of foreign operations, net of reclassifications to net earnings, net of tax   30 (6)  
Gains (losses) on financial instruments designated as hedges of foreign operations, net of reclassifications to net earnings, net of tax   (28) 9  
Other        
Accumulated other comprehensive income, end of the period   (34) (36) (39)
Cash flow hedges        
Components and changes in accumulated other comprehensive Income (loss)        
Accumulated other comprehensive income, beginning of the period   (129) (228)  
Cash flow hedges        
Gains (losses) on derivatives designated as cash flow hedges, net of reclassifications to net earnings and to non-financial assets, net of tax   194 99  
Other        
Accumulated other comprehensive income, end of the period   65 (129) (228)
Net impact related to cash flow hedges   53 27  
Employee future benefits        
Components and changes in accumulated other comprehensive Income (loss)        
Accumulated other comprehensive income, beginning of the period   3 8  
Employee future benefits        
Net actuarial gains on defined benefit plans, net of tax   9 (5)  
Other        
Accumulated other comprehensive income, end of the period   12 3 8
Net of income tax expense   (3) 1  
Other        
Components and changes in accumulated other comprehensive Income (loss)        
Accumulated other comprehensive income, beginning of the period   (2) 37  
Other        
Change in ownership of TransAlta Renewables $ 64 0 (64)  
Intercompany and third-party investments at FVTOCI   0 25  
Accumulated other comprehensive income, end of the period   $ (2) $ (2) $ 37
[1] Net of income tax recovery of $4 million for the year ended Dec. 31, 2024 (2023 — $1 million expense, 2022 — $3 million recovery).
[2] Net of income tax expense of $57 million for the year ended Dec. 31, 2024 (2023 — $10 million expense, 2022 — $138 million recovery).