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Significant Events - Investment in and Acquisition by TransAlta Renewables of the Canadian Assets (Details)
Nov. 09, 2017
CAD ($)
Jan. 06, 2016
CAD ($)
shares
$ / shares
MW
Dec. 31, 2018
CAD ($)
shares
Dec. 31, 2017
shares
Nov. 30, 2016
CAD ($)
Mar. 17, 2016
shares
Disclosure of detailed information about business combination [line items]            
Number of shares issued | shares     38,600,000 38,600,000   1,824,620.00
Transfer of equity from non-controlling interests     $ 1,000,000   $ 38,000,000  
TransAlta Renewables | Canadian Assets            
Disclosure of detailed information about business combination [line items]            
Aggregate value of business combination   $ 540,000,000     520,000,000  
Capacity of facility (in megawatts) | MW   611        
Cash paid   $ 173,000,000        
Common shares issued (in shares) | shares   15,640,583        
Value of common shares issued   $ 152,000,000        
Subscription receipts (in shares) | shares   17,692,750        
Price per subscription receipt   $ 9.75        
Number of shares received per subscription receipt (in shares) | shares   1        
Dividend per subscription receipt (in CAD per share) | $ / shares   $ 0.07        
Number of shares issued | shares   17,692,750        
Dividends paid, ordinary shares   $ 1,000,000        
Share issue related cost   8,000,000        
Effect of share issuance cost on income cost   2,000,000        
Working capital and certain capital spares acquired         $ 19,000,000  
Convertible unsecured debenture | TransAlta Renewables | Canadian Assets            
Disclosure of detailed information about business combination [line items]            
Notes and debentures issued   $ 215,000,000        
Repayments of bonds, notes and debentures $ 218,000,000          
Payment of accrued interest $ 3,000,000