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Non-Controlling Interests - Financial Position of Non-Controlling Interests (Details) - CAD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Oct. 04, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of subsidiaries [line items]        
Current assets   $ 1,580 $ 3,714  
Current liabilities   (1,742) (2,888)  
Total equity   1,664 1,989 $ 2,593
Equity attributable to non-controlling interests   127 879  
TransAlta Cogeneration, L.P.        
Disclosure of subsidiaries [line items]        
Current assets   43 127  
Long-term assets   193 253  
Current liabilities   (41) (62)  
Long-term liabilities   (34) (27)  
Total equity   (161) (291)  
Equity attributable to non-controlling interests   $ (79) $ (147)  
Non-controlling interests’ share (per cent)   49.99% 49.99%  
Kent Hills Wind L.P.        
Disclosure of subsidiaries [line items]        
Current assets   $ 35    
Long-term assets   481    
Current liabilities   (42)    
Long-term liabilities   (188)    
Total equity   (285)    
Equity attributable to non-controlling interests   $ (48)    
Non-controlling interests’ share (per cent)   17.00%    
TransAlta Renewables Inc.        
Disclosure of subsidiaries [line items]        
Current assets     $ 240  
Long-term assets     2,989  
Current liabilities     (306)  
Long-term liabilities     (1,118)  
Total equity     (1,805)  
Equity attributable to non-controlling interests     $ (732)  
Non-controlling interests’ share (per cent) 39.90%   39.90%