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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, 2023
CAD ($)
Dec. 31, 2023
AUD ($)
Dec. 31, 2022
CAD ($)
Dec. 31, 2021
CAD ($)
Disclosure of detailed information about borrowings [line items]        
Exchangeable securities $ 744   $ 739  
Property, plant and equipment 5,714   5,556 $ 5,320
Intangible assets other than goodwill 223   252 256
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 1,500   1,500  
Intangible assets other than goodwill 61   70  
Non-recourse        
Disclosure of detailed information about borrowings [line items]        
Exchangeable securities 1,700   1,800  
Restricted cash 79   50  
Non-recourse | Secured by first rate ranking charge over subsidiaries        
Disclosure of detailed information about borrowings [line items]        
Notional amount 1,400   1,400  
Non-recourse | Secured by equity interests of the issuer        
Disclosure of detailed information about borrowings [line items]        
Notional amount 85   94  
Restricted Use Debt        
Disclosure of detailed information about borrowings [line items]        
Proceeds received 3 $ 3    
Secured Debt | TransAlta OCP        
Disclosure of detailed information about borrowings [line items]        
Notional amount $ 217   $ 241