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Credit Facilities, Long-Term Debt and Lease Liabilities - Restrictions on Non-Recourse Debt and Security (Details)
$ in Millions, $ in Millions
 12 Months Ended
Jul. 20, 2018
CAD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
AUD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2018
CAD ($)
Disclosure of detailed information about borrowings [line items]          
Other borrowings   $ 730   $ 326  
PP&E   5,822   6,207 $ 6,164
Intangible assets   313   318 373
Alberta Off-Coal Agreement $ 40 40   40 $ 40
Alberta off-coal agreement, annual cash payments, net $ 37        
US Wind Projects - Big Level          
Disclosure of detailed information about borrowings [line items]          
Restricted cash (Note 22)   9   15  
TransAlta OCP          
Disclosure of detailed information about borrowings [line items]          
Restricted cash (Note 22)   17   17  
TEC          
Disclosure of detailed information about borrowings [line items]          
Restricted cash (Note 22)   45   0  
Renewable generation facilities          
Disclosure of detailed information about borrowings [line items]          
PP&E   1,277   967  
Intangible assets   88   63  
Non-recourse debt          
Disclosure of detailed information about borrowings [line items]          
Other borrowings   1,800   1,100  
Restricted cash (Note 22)   73   42  
Non-recourse debt | Secured by first rate ranking charge over subsidiaries          
Disclosure of detailed information about borrowings [line items]          
Notional amount   1,441   719  
Non-recourse debt | Secured by equity interests of the issuer          
Disclosure of detailed information about borrowings [line items]          
Notional amount   111   119  
Restricted Use Debt          
Disclosure of detailed information about borrowings [line items]          
Proceeds from issue of bonds, notes and debentures     $ 7    
Secured Debt | TransAlta OCP          
Disclosure of detailed information about borrowings [line items]          
Notional amount   $ 285   $ 305