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Credit Facilities, Long-Term Debt and Lease Liabilities - Credit Facilities (Details) - CAD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about borrowings [line items]        
Cash and cash equivalents $ 348 $ 1,134 $ 947 $ 703
Non-Committed        
Disclosure of detailed information about borrowings [line items]        
Outstanding letters of credit 187      
Committed syndicated bank facility | Committed credit facilities        
Disclosure of detailed information about borrowings [line items]        
Undrawn borrowing capacity 1,400 $ 1,000    
Committed        
Disclosure of detailed information about borrowings [line items]        
Outstanding letters of credit 595      
Committed | TransAlta syndicated credit facility        
Disclosure of detailed information about borrowings [line items]        
Outstanding letters of credit 417      
Committed | TransAlta syndicated credit facility | TransAlta Renewables Inc.        
Disclosure of detailed information about borrowings [line items]        
Cash and cash equivalents $ 345