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Credit Facilities, Long-Term Debt and Lease Liabilities - Credit facilities summarized (Details) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Disclosure of detailed information about borrowings [line items]    
Cash drawings $ 3,466 $ 3,653
Cash collateral 9 260
Committed    
Disclosure of detailed information about borrowings [line items]    
Facility size 2,590  
Outstanding letters of credit 595  
Cash drawings 400  
Available capacity 1,595  
Non-Committed    
Disclosure of detailed information about borrowings [line items]    
Facility size 400  
Outstanding letters of credit 187  
Cash drawings 0  
Available capacity 213  
TransAlta Renewables Inc.    
Disclosure of detailed information about borrowings [line items]    
Cash collateral 145  
TransAlta syndicated credit facility | Committed    
Disclosure of detailed information about borrowings [line items]    
Facility size 1,950  
Outstanding letters of credit 417  
Cash drawings 0  
Available capacity 1,533  
TransAlta bilateral credit facilities | Committed    
Disclosure of detailed information about borrowings [line items]    
Facility size 240  
Outstanding letters of credit 178  
Cash drawings 0  
Available capacity 62  
TransAlta Term Facility    
Disclosure of detailed information about borrowings [line items]    
Cash drawings 397 $ 396
TransAlta Term Facility | Committed    
Disclosure of detailed information about borrowings [line items]    
Facility size 400  
Outstanding letters of credit 0  
Cash drawings 400  
Available capacity 0  
TransAlta demand facilities | Non-Committed    
Disclosure of detailed information about borrowings [line items]    
Facility size 400  
Outstanding letters of credit 187  
Cash drawings 0  
Available capacity $ 213