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Credit Facilities, Long-Term Debt and Lease Liabilities - Restricted Cash and Letters of Credit (Details) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Letter of credit    
Disclosure of detailed information about borrowings [line items]    
Bonds issued $ 782 $ 1,175
Exercised amount 0 0
Uncommitted demand letter facility    
Disclosure of detailed information about borrowings [line items]    
Outstanding letters of credit 187  
Committed    
Disclosure of detailed information about borrowings [line items]    
Facility size 2,590  
Outstanding letters of credit 595  
Committed | TransAlta syndicated credit facility    
Disclosure of detailed information about borrowings [line items]    
Facility size 1,950  
Outstanding letters of credit 417  
Committed | TransAlta bilateral credit facilities    
Disclosure of detailed information about borrowings [line items]    
Facility size 240  
Outstanding letters of credit 178  
Non-Committed    
Disclosure of detailed information about borrowings [line items]    
Facility size 400  
Outstanding letters of credit 187  
Non-Committed | TransAlta demand facilities    
Disclosure of detailed information about borrowings [line items]    
Facility size 400  
Outstanding letters of credit 187  
TransAlta OCP    
Disclosure of detailed information about borrowings [line items]    
Restricted cash 17 17
TEC    
Disclosure of detailed information about borrowings [line items]    
Restricted cash $ 52 $ 53