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Accumulated Other Comprehensive Income (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Components and changes in accumulated other comprehensive Income (loss)      
Accumulated other comprehensive income, beginning of the period $ 489    
Currency translation adjustment      
Losses on translating net assets of foreign operations, net of reclassifications to net earnings, net of tax (43) $ 25  
Gains (losses) on financial instruments designated as hedges of foreign operations, net of tax [1] (41) 50 $ 18
Cash flow hedges      
Gains (losses) on derivatives designated as cash flow hedges, net of tax [2] (8) 214 179
Other      
Intercompany available-for-sale investments   0  
Accumulated other comprehensive income, end of the period 481 489  
Income tax relating to exchange differences on translation of other comprehensive income 0 0 11
Income tax relating to hedges of net investments in foreign operations of other comprehensive income 0 2 5
Net impact related to cash flow hedges (12) (108) 51
Income tax relating to net actuarial gains (losses) 5 (4) 4
Reserve of exchange differences on translation      
Components and changes in accumulated other comprehensive Income (loss)      
Accumulated other comprehensive income, beginning of the period (26) (1)  
Currency translation adjustment      
Losses on translating net assets of foreign operations, net of reclassifications to net earnings, net of tax 84 (89)  
Gains (losses) on financial instruments designated as hedges of foreign operations, net of tax (41) 64  
Other      
Accumulated other comprehensive income, end of the period 17 (26) (1)
Income tax relating to exchange differences on translation of other comprehensive income 0 11  
Income tax relating to hedges of net investments in foreign operations of other comprehensive income 0 4  
Reserve of cash flow hedges [member]      
Components and changes in accumulated other comprehensive Income (loss)      
Accumulated other comprehensive income, beginning of the period 562 456  
Cash flow hedges      
Gains (losses) on derivatives designated as cash flow hedges, net of tax (54) 106  
Other      
Accumulated other comprehensive income, end of the period 508 562 456
Net impact related to cash flow hedges (12) 108  
Reserve of remeasurements of defined benefit plans [member]      
Components and changes in accumulated other comprehensive Income (loss)      
Accumulated other comprehensive income, beginning of the period (44) (38)  
Employee future benefits      
Net actuarial gains (losses) on defined benefit plans, net of tax 15 (6)  
Other      
Accumulated other comprehensive income, end of the period (29) (44) (38)
Income tax relating to net actuarial gains (losses) (5) 4  
Other reserves [member]      
Components and changes in accumulated other comprehensive Income (loss)      
Accumulated other comprehensive income, beginning of the period (3) (18)  
Other      
Change in ownership of TransAlta Renewables 4 4  
Intercompany available-for-sale investments   11  
Accumulated other comprehensive income, end of the period $ (15) $ (3) $ (18)
[1] (5) Net of income tax of nil for the year ended Dec. 31, 2018 (2017 - 2 million expense, 2016 - 5 million expense).
[2] (7) Net of income tax recovery of 1 million for the year ended Dec. 31, 2018 (2017 - 77 million recovery, 2016 - 92 million expense).