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Credit Facilities, Long-Term Debt and Lease Liabilities - Credit facilities summarized (Details) - CAD ($)
$ in Millions
Dec. 31, 2024
Jun. 30, 2024
Dec. 31, 2023
Disclosure of detailed information about borrowings [line items]      
Cash drawings $ 3,808   $ 3,466
Cash collateral 9   9
Committed      
Disclosure of detailed information about borrowings [line items]      
Facility size 2,916    
Outstanding letters of credit 645    
Cash drawings 769    
Available capacity 1,502    
Non-committed      
Disclosure of detailed information about borrowings [line items]      
Facility size 400    
Outstanding letters of credit 220    
Cash drawings 0    
Available capacity 180    
TransAlta Renewables Inc.      
Disclosure of detailed information about borrowings [line items]      
Cash collateral 124    
Syndicated credit facility | Committed      
Disclosure of detailed information about borrowings [line items]      
Facility size 1,950    
Outstanding letters of credit 456    
Cash drawings 145    
Available capacity 1,349    
Bilateral credit facilities | Committed      
Disclosure of detailed information about borrowings [line items]      
Facility size 240    
Outstanding letters of credit 161    
Cash drawings 0    
Available capacity 79    
Term Facility      
Disclosure of detailed information about borrowings [line items]      
Cash drawings 400   $ 397
Term Facility | Committed      
Disclosure of detailed information about borrowings [line items]      
Facility size 400    
Outstanding letters of credit 0    
Cash drawings 400    
Available capacity 0    
Heartland Credit Facilities | Committed      
Disclosure of detailed information about borrowings [line items]      
Facility size 276    
Outstanding letters of credit 14    
Cash drawings 224    
Available capacity 38    
Heartland EDC letter of credit facility | Committed      
Disclosure of detailed information about borrowings [line items]      
Facility size 50    
Outstanding letters of credit 14    
Cash drawings 0    
Available capacity 36    
Demand facilities | TransAlta Renewables Inc. | Non-committed      
Disclosure of detailed information about borrowings [line items]      
Facility size   $ 400  
Outstanding letters of credit 220    
Cash drawings 0    
Available capacity $ 180