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Capital Disclosure of components of capital (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Jun. 28, 2018
Dec. 31, 2015
Disclosure of components of capital [Line Items]          
Long-term debt $ 3,267 $ 3,707      
Increase (decrease) in financial liabilities (440)        
Equity 4,134 4,385 $ 4,663    
Preferred shares       $ 33  
Contributed surplus 11 10      
Deficit (1,496) (1,209)      
Accumulated other comprehensive income 481 489      
Non-controlling interests 1,137 1,059      
Cash and cash equivalents (89) (314) (305)   $ (54)
Increase (decrease) in cash and cash equivalents 225 (9) (251)    
Current restricted cash and cash equivalents (66) 0      
Fair value asset of hedging instruments on long-term debt (10) (30)      
Increase (decrease) in hedging instruments, liabilities 20        
Total capital 7,275 7,748      
Increase (decrease) in capital (473)        
Common shares          
Disclosure of components of capital [Line Items]          
Equity 3,059 3,094      
Increase (decrease) in equity (35)        
Preferred shares          
Disclosure of components of capital [Line Items]          
Equity 942 942 942    
Increase (decrease) in equity 0        
Contributed surplus          
Disclosure of components of capital [Line Items]          
Equity 11 10 9    
Increase (decrease) in equity 1        
Deficit          
Disclosure of components of capital [Line Items]          
Equity (1,496) (1,209) (933)    
Increase (decrease) in equity (287)        
Accumulated other comprehensive income          
Disclosure of components of capital [Line Items]          
Equity [1] 481 489 399    
Increase (decrease) in equity (8)        
Non-controlling interests          
Disclosure of components of capital [Line Items]          
Equity 1,137 1,059 $ 1,152    
Increase (decrease) in equity 78        
TransAlta OCP          
Disclosure of components of capital [Line Items]          
Current restricted cash and cash equivalents (27) $ 0      
Increase (decrease) in restricted cash and cash equivalents $ (27)        
[1] (1) Refer to Note 26 for details on components of, and changes in, accumulated other comprehensive income (loss).