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Credit Facilities, Long-Term Debt and Lease Liabilities - Credit facilities summarized (Details) - CAD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Disclosure of detailed information about borrowings [line items]    
Cash drawings $ 3,653 $ 3,267
Cash collateral 260 18
Committed    
Disclosure of detailed information about borrowings [line items]    
Facility size 2,590  
Outstanding letters of credit 957  
Cash drawings 433  
Available capacity 1,200  
Non-Committed    
Disclosure of detailed information about borrowings [line items]    
Facility size 400  
Outstanding letters of credit 218  
Cash drawings 0  
Available capacity 182  
TransAlta Renewables Inc.    
Disclosure of detailed information about borrowings [line items]    
Cash collateral 304  
Syndicated Credit Facility | Committed    
Disclosure of detailed information about borrowings [line items]    
Facility size 1,250  
Outstanding letters of credit 738  
Cash drawings 0  
Available capacity 512  
Syndicated Credit Facility | TransAlta Renewables Inc. | Committed    
Disclosure of detailed information about borrowings [line items]    
Facility size 700  
Outstanding letters of credit 0  
Cash drawings 33  
Available capacity 667  
TransAlta Corporation bilateral credit facilities | Committed    
Disclosure of detailed information about borrowings [line items]    
Facility size 240  
Outstanding letters of credit 219  
Cash drawings 0  
Available capacity 21  
TransAlta Corporation Term Facility    
Disclosure of detailed information about borrowings [line items]    
Cash drawings 396 $ 0
TransAlta Corporation 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  
Demand Facility | Non-Committed    
Disclosure of detailed information about borrowings [line items]    
Facility size 250  
Outstanding letters of credit 120  
Cash drawings 0  
Available capacity 130  
Demand Facility | TransAlta Renewables Inc. | Non-Committed    
Disclosure of detailed information about borrowings [line items]    
Facility size 150  
Outstanding letters of credit 98  
Cash drawings 0  
Available capacity $ 52