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Credit Facilities, Long-Term Debt, and Finance Lease Obligations - Other (Details) - CAD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of detailed information about borrowings [line items]      
Notional amount $ 3,104 $ 3,234  
Property, plant and equipment 6,207 6,164 $ 6,578
Intangible assets 318 $ 373 $ 364
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) 42 $ 33  
Non-recourse | Secured by first rate ranking charge over subsidiaries      
Disclosure of detailed information about borrowings [line items]      
Notional amount 719 766  
Non-recourse | Secured by equity interests of the issuer      
Disclosure of detailed information about borrowings [line items]      
Notional amount 119 127  
Renewable generation facilities      
Disclosure of detailed information about borrowings [line items]      
Property, plant and equipment 967 1,021  
Intangible assets 63 70  
TransAlta OCP      
Disclosure of detailed information about borrowings [line items]      
Restricted cash (Note 22) 17 35  
TransAlta OCP | Secured Debt      
Disclosure of detailed information about borrowings [line items]      
Notional amount 305 342  
Kent Hills Wind L.P.      
Disclosure of detailed information about borrowings [line items]      
Restricted cash (Note 22) $ 0 $ 31  
Interest rate 4.55%