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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 ($)
Dec. 31, 2021
CAD ($)
Dec. 31, 2021
AUD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2019
CAD ($)
Disclosure of detailed information about borrowings [line items]          
Other borrowings   $ 735   $ 730  
Borrowings   3,267   3,361  
PP&E   5,320   5,822 $ 6,207
Intangible assets   256   313 318
Alberta Off-Coal Agreement $ 40 40   40 $ 40
Alberta off-coal agreement, annual cash payments, net   37      
TransAlta OCP          
Disclosure of detailed information about borrowings [line items]          
Restricted cash (Note 22)   17   17  
Renewable generation facilities          
Disclosure of detailed information about borrowings [line items]          
PP&E   1,500   1,000  
Intangible assets   78   88  
Non-recourse debt          
Disclosure of detailed information about borrowings [line items]          
Other borrowings   1,900   1,800  
Restricted cash (Note 22)   67   73  
Borrowings   221      
Borrowings, make-whole amount   39      
Adjustments for undistributed profits of associates   6      
Non-recourse debt | Secured by first rate ranking charge over subsidiaries          
Disclosure of detailed information about borrowings [line items]          
Notional amount   1,500   1,400  
Non-recourse debt | Secured by equity interests of the issuer          
Disclosure of detailed information about borrowings [line items]          
Notional amount   103   111  
Restricted Use Debt          
Disclosure of detailed information about borrowings [line items]          
Proceeds from issue of bonds, notes and debentures   3 $ 4    
Secured Debt | TransAlta OCP          
Disclosure of detailed information about borrowings [line items]          
Notional amount   $ 263   $ 285