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Credit Facilities, Long-Term Debt, and Finance Lease Obligations - Credit Facilities (Details)
$ in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CAD ($)
Dec. 31, 2017
CAD ($)
Dec. 31, 2016
CAD ($)
Disclosure of detailed information about borrowings [line items]            
Line of credit facility, cancelled capacity     $ 200      
Notional amount   $ 3,104   $ 3,234    
Borrowings   3,212   3,267    
Cash and cash equivalents   411   89 $ 314 $ 305
Restricted cash   32   66    
US Wind Projects - Big Level            
Disclosure of detailed information about borrowings [line items]            
Restricted cash (Note 22)   15        
Borrowing costs incurred   122        
Tax equity funding $ 85          
Proceeds from tax equity funding   91        
US Wind Projects - Antrim            
Disclosure of detailed information about borrowings [line items]            
Tax equity funding $ 41          
Accelerated tax depreciation   35        
Lakeswind            
Disclosure of detailed information about borrowings [line items]            
Borrowing costs incurred   23        
Syndicated Bank Credit Facility [Member]            
Disclosure of detailed information about borrowings [line items]            
Maximum borrowing capacity under line of credit   1,300        
Committed Bilateral Credit Facilities Expiring In 2019 [Member]            
Disclosure of detailed information about borrowings [line items]            
Maximum borrowing capacity under line of credit   240        
Credit facilities | Committed credit facilities            
Disclosure of detailed information about borrowings [line items]            
Maximum borrowing capacity under line of credit   2,200   2,000    
Undrawn borrowing capacity under line of credit   1,300   900    
Actual drawings on borrowings   220   339    
Long-term Line Of Credit   900   1,100    
Letter of credit | Committed credit facilities            
Disclosure of detailed information about borrowings [line items]            
Long-term Line Of Credit   690   720    
Corporation and TransAlta Renewables | Syndicated Bank Credit Facility [Member]            
Disclosure of detailed information about borrowings [line items]            
Maximum borrowing capacity under line of credit   2,000   1,800    
Line of credit facility, increase (decrease)       250    
Line of credit facility, increase (decrease)       250    
TransAlta Renewables | Syndicated Bank Credit Facility [Member]            
Disclosure of detailed information about borrowings [line items]            
Maximum borrowing capacity under line of credit   700   500    
Line of credit facility, increase (decrease)   200        
Line of credit facility, increase (decrease)   200        
TransAlta OCP            
Disclosure of detailed information about borrowings [line items]            
Restricted cash (Note 22)   17   35    
Restricted cash and cash equivalents, principal amount   (10)        
Restricted cash   $ 10   $ 27