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Credit Facilities, Long-Term Debt and Lease Liabilities - Credit Facilities (Details) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about borrowings [line items]        
Outstanding letters of credit $ 902      
Available capacity 1,288 $ 1,500    
Cash and cash equivalents 947 703 $ 411 $ 89
Canadian committed bilateral credit facilities        
Disclosure of detailed information about borrowings [line items]        
Outstanding letters of credit 186      
Available capacity 54      
Sustainability Linked Loan        
Disclosure of detailed information about borrowings [line items]        
Maximum borrowing capacity under line of credit 1,300      
Letter of credit        
Disclosure of detailed information about borrowings [line items]        
Debt instruments issued 157      
Credit facilities | Committed credit facilities        
Disclosure of detailed information about borrowings [line items]        
Undrawn borrowing capacity under line of credit 1,300 1,500    
Corporation and TransAlta Renewables | Syndicated Bank Credit Facility        
Disclosure of detailed information about borrowings [line items]        
Maximum borrowing capacity under line of credit 2,000 2,000    
TransAlta OCP        
Disclosure of detailed information about borrowings [line items]        
Restricted cash (Note 22) 17 $ 17    
Restricted cash and cash equivalents, principal amount $ 17