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Credit Facilities, Long-Term Debt and Lease Liabilities - Non-Recourse Debt and Other (Details) - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Sep. 14, 2023
May 08, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about borrowings [line items]            
Cash and cash equivalents $ 337 $ 348     $ 1,134 $ 947
Non-committed            
Disclosure of detailed information about borrowings [line items]            
Outstanding letters of credit 220          
Committed            
Disclosure of detailed information about borrowings [line items]            
Outstanding letters of credit 645          
Non-recourse Pingston Power Inc Bond            
Disclosure of detailed information about borrowings [line items]            
Notional amount     $ 39 $ 46    
Interest     6.145%      
Committed credit facilities | Committed syndicated bank facility            
Disclosure of detailed information about borrowings [line items]            
Undrawn borrowing capacity 1,500 $ 1,400        
Syndicated credit facility | Committed            
Disclosure of detailed information about borrowings [line items]            
Outstanding letters of credit 456          
Syndicated credit facility | Committed | TransAlta Renewables Inc.            
Disclosure of detailed information about borrowings [line items]            
Cash and cash equivalents $ 336