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Credit Facilities, Long-Term Debt, and Finance Lease Obligations - Other (Details) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of detailed information about borrowings [line items]      
Restricted cash (Note 22) $ 0 $ 30  
Notional amount 3,234 3,664  
Property, plant and equipment (Note 17) 6,164 $ 6,578 $ 6,824
Other | 5.9% Unsecured Commercial Loan Obligation due 2023      
Disclosure of detailed information about borrowings [line items]      
Interest rate   5.90%  
Non-recourse      
Disclosure of detailed information about borrowings [line items]      
Restricted cash (Note 22) 33 $ 35  
Non-recourse | Secured by first rate ranking charge over subsidiaries      
Disclosure of detailed information about borrowings [line items]      
Notional amount 766 848  
Non-recourse | Secured by equity interests of the issuer      
Disclosure of detailed information about borrowings [line items]      
Notional amount 127 174  
Renewable generation facilities      
Disclosure of detailed information about borrowings [line items]      
Property, plant and equipment (Note 17) 1,021 1,107  
TransAlta OCP      
Disclosure of detailed information about borrowings [line items]      
Restricted cash (Note 22) 35 0  
TransAlta OCP | Secured Debt      
Disclosure of detailed information about borrowings [line items]      
Notional amount 342    
Kent Hills Wind L.P.      
Disclosure of detailed information about borrowings [line items]      
Restricted cash (Note 22) $ 31 $ 30  
Interest rate 4.55%