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Credit Facilities, Long-Term Debt and Lease Liabilities - Restrictions on Non-Recourse Debt and Security (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
CAD ($)
Dec. 31, 2024
AUD ($)
Dec. 31, 2023
CAD ($)
Dec. 31, 2022
CAD ($)
Disclosure of detailed information about borrowings [line items]        
Exchangeable securities $ 750      
Property, plant and equipment 6,020   $ 5,714 $ 5,556
Intangible assets other than goodwill 281   223 252
Annual cash payments (40)   (40) $ (40)
Annual cash payments, net 37      
TransAlta OCP        
Disclosure of detailed information about borrowings [line items]        
Restricted cash 17   17  
Renewable generation facilities        
Disclosure of detailed information about borrowings [line items]        
Property, plant and equipment 1,750   1,500  
Intangible assets other than goodwill 84   61  
Non-recourse        
Disclosure of detailed information about borrowings [line items]        
Exchangeable securities 1,800   1,700  
Restricted cash 117   79  
Non-recourse | Secured by first rate ranking charge over subsidiaries        
Disclosure of detailed information about borrowings [line items]        
Notional amount 1,500   1,400  
Non-recourse | Secured by equity interests of the issuer        
Disclosure of detailed information about borrowings [line items]        
Notional amount 75   85  
Restricted Use Debt        
Disclosure of detailed information about borrowings [line items]        
Proceeds received 5 $ 6    
Secured Debt | TransAlta OCP        
Disclosure of detailed information about borrowings [line items]        
Notional amount $ 192   $ 217