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Common Shares - Issued and Outstanding (Details) - CAD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
Oct. 05, 2023
Dec. 31, 2023
Dec. 31, 2022
Common shares        
Provision for repurchase of common shares under ASPP $ (19)      
TransAlta Renewables Inc.        
Common shares        
Transaction costs   $ 11    
TransAlta Renewables Inc. | Issued capital        
Common shares        
Transaction costs   $ 4 $ 4  
Common shares        
Common shares        
Issued and outstanding, beginning of period     268.1 271.0
Purchased and cancelled under the NCIB     (7.5) (4.3)
Share-based payment plans     0.8 0.9
Stock options exercised     0.7 0.5
Issued for acquisition of TransAlta Renewables     46.5 0.0
Provision for repurchase of common shares under ASPP     (1.7)  
Issued and outstanding, end of year 306.9   306.9 268.1
Issued and outstanding, end of year     $ 2,863 $ 2,901
Purchased and cancelled under the NCIB     (80) (46)
Share-based payment plans     6 5
Stock options exercised     5 3
Issued for acquisition of TransAlta Renewables     510 0
Provision for repurchase of common shares under ASPP     (19)  
Issued and outstanding, end of year $ 3,285   $ 3,285 $ 2,863
Common shares | Prior To Automatic Share Purchase Plan        
Common shares        
Issued and outstanding, end of year 308.6   308.6  
Issued and outstanding, end of year $ 3,304   $ 3,304