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Credit Facilities, Long-Term Debt and Lease Liabilities - Restricted Cash and Letters of Credit (Details) - CAD ($)
$ in Millions
Dec. 31, 2024
Jun. 30, 2024
Dec. 31, 2023
Letter of credit      
Disclosure of detailed information about borrowings [line items]      
Outstanding letters of credit $ 865   $ 782
Exercised amount 0   0
Committed      
Disclosure of detailed information about borrowings [line items]      
Facility size 2,916    
Outstanding letters of credit 645    
Committed | Syndicated credit facility      
Disclosure of detailed information about borrowings [line items]      
Facility size 1,950    
Outstanding letters of credit 456    
Committed | Bilateral credit facilities      
Disclosure of detailed information about borrowings [line items]      
Facility size 240    
Outstanding letters of credit 161    
Non-committed      
Disclosure of detailed information about borrowings [line items]      
Facility size 400    
Outstanding letters of credit 220    
TransAlta OCP      
Disclosure of detailed information about borrowings [line items]      
Restricted cash 17   17
TEC      
Disclosure of detailed information about borrowings [line items]      
Restricted cash 52   $ 52
TransAlta Renewables Inc. | Non-committed | Demand facilities      
Disclosure of detailed information about borrowings [line items]      
Facility size   $ 400  
Outstanding letters of credit $ 220