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Business Acquisitions - Alta Renewables (Details)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Oct. 05, 2023
CAD ($)
shares
$ / shares
Dec. 31, 2024
CAD ($)
Dec. 31, 2023
CAD ($)
Disclosure of detailed information about business combination [line items]      
Non-controlling Interests, reduced     $ 809
Committed      
Disclosure of detailed information about business combination [line items]      
Facility size   $ 2,916  
Committed | Syndicated credit facility      
Disclosure of detailed information about business combination [line items]      
Facility size   1,950  
Deficit      
Disclosure of detailed information about business combination [line items]      
Non-controlling Interests, reduced     625
Attributable to non-controlling interests      
Disclosure of detailed information about business combination [line items]      
Non-controlling Interests, reduced $ 630   630
Other      
Disclosure of detailed information about business combination [line items]      
Change in ownership of TransAlta Renewables 64 0 $ (64)
TransAlta Renewables Inc.      
Disclosure of detailed information about business combination [line items]      
Total purchase consideration transferred 1,300    
Cash consideration $ 800    
Common shares issued (in shares) | shares 46    
Value of common shares issued $ 514    
Price per share of shares issued (in CAD per share) | $ / shares $ 11.06    
Transaction costs $ 11    
TransAlta Renewables Inc. | Committed | Syndicated credit facility      
Disclosure of detailed information about business combination [line items]      
Additional borrowings 700    
Facility size 2,000    
TransAlta Renewables Inc. | Issued capital      
Disclosure of detailed information about business combination [line items]      
Transaction costs 4 $ 4  
TransAlta Renewables Inc. | Deficit      
Disclosure of detailed information about business combination [line items]      
Transaction costs $ 7