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Credit Facilities, Long-Term Debt and Lease Liabilities - Credit facilities summarized (Details) - CAD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Disclosure of detailed information about borrowings [line items]    
Facility size $ 2,190  
Outstanding letters of credit 902  
Borrowings 3,267 $ 3,361
Available capacity 1,288 1,500
Financial assets pledged as collateral for liabilities or contingent liabilities 18 0
TransAlta Renewables Inc.    
Disclosure of detailed information about borrowings [line items]    
Financial assets pledged as collateral for liabilities or contingent liabilities 55  
Revolving committed syndicated bank facility    
Disclosure of detailed information about borrowings [line items]    
Facility size 1,250  
Outstanding letters of credit 618  
Borrowings 0  
Available capacity 632  
Canadian committed bilateral credit facilities    
Disclosure of detailed information about borrowings [line items]    
Facility size 240  
Outstanding letters of credit 186  
Borrowings 0  
Available capacity 54  
Committed Credit Facility | TransAlta Renewables Inc.    
Disclosure of detailed information about borrowings [line items]    
Facility size 700  
Outstanding letters of credit 98  
Borrowings 0  
Available capacity 602  
Credit facilities    
Disclosure of detailed information about borrowings [line items]    
Borrowings $ 0 $ 114