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Non-Controlling Interests - Financial Position of Non-Controlling Interests (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of subsidiaries [line items]      
Current assets $ 3,714 $ 2,197  
Current liabilities (2,888) (1,931)  
Total equity 1,989 2,593 $ 3,436
Non-controlling interests 879 1,011  
TransAlta Renewables Inc.      
Disclosure of subsidiaries [line items]      
Current assets 240 430  
Long-term assets 2,989 3,319  
Current liabilities (306) (593)  
Long-term liabilities (1,118) (1,033)  
Total equity (1,805) (2,123)  
Non-controlling interests $ (732) $ (869)  
Non-controlling interests’ share (per cent) 39.90% 39.90%  
TransAlta Cogeneration, L.P.      
Disclosure of subsidiaries [line items]      
Current assets $ 127 $ 66  
Long-term assets 253 312  
Current liabilities (62) (52)  
Long-term liabilities (27) (36)  
Total equity (291) (290)  
Non-controlling interests $ (147) $ (142)  
Non-controlling interests’ share (per cent) 49.99% 49.99%