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Non-Controlling Interests - Financial Position of Non-Controlling Interests (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of subsidiaries [line items]      
Current assets $ 1,773 $ 1,580  
Current liabilities (2,569) (1,742)  
Total equity 1,843 1,664 $ 1,989
Equity attributable to non-controlling interests 97 127  
TransAlta Cogeneration, L.P.      
Disclosure of subsidiaries [line items]      
Current assets 47 43  
Long-term assets 130 193  
Current liabilities (48) (41)  
Long-term liabilities (32) (34)  
Total equity (97) (161)  
Equity attributable to non-controlling interests $ (46) $ (79)  
Non-controlling interest share (per cent) 49.99% 49.99%  
Kent Hills Wind L.P.      
Disclosure of subsidiaries [line items]      
Current assets $ 33 $ 35  
Long-term assets 463 481  
Current liabilities (26) (42)  
Long-term liabilities (174) (188)  
Total equity (296) (285)  
Equity attributable to non-controlling interests $ (51) $ (48)  
Non-controlling interest share (per cent) 17.00% 17.00%