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Non-Controlling Interests - Financial Position of Non-Controlling Interests (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of subsidiaries [line items]      
Current assets $ 2,197 $ 1,902  
Current liabilities (1,931) (935)  
Total equity 2,593 3,436 $ 4,062
Non-controlling interests 1,011 1,084  
TransAlta Renewables Inc.      
Disclosure of subsidiaries [line items]      
Current assets 430 743  
Long-term assets 3,319 2,913  
Current liabilities (593) (364)  
Long-term liabilities (1,033) (987)  
Total equity (2,123) (2,305)  
Non-controlling interests $ (869) $ (948)  
Ownership and voting rights percentage 39.90% 39.90%  
TransAlta Cogeneration, L.P.      
Disclosure of subsidiaries [line items]      
Current assets $ 66 $ 69  
Long-term assets 312 323  
Current liabilities (52) (78)  
Long-term liabilities (36) (37)  
Total equity (290) (277)  
Non-controlling interests $ (142) $ (136)  
Ownership and voting rights percentage 49.99% 49.99%  
TransAlta Cogeneration, L.P. | TransAlta Cogeneration, L.P.      
Disclosure of subsidiaries [line items]      
Ownership and voting rights percentage 49.99%