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Accumulated Other Comprehensive Income (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Components and changes in accumulated other comprehensive Income (loss)      
Accumulated other comprehensive income, beginning of the period $ 481    
Currency translation adjustment      
Losses on translating net assets of foreign operations, net of reclassifications to net earnings, net of tax 38 $ (43)  
Gains (losses) on financial instruments designated as hedges of foreign operations, net of tax [1] 21 (41) $ 50
Cash flow hedges      
Gains (losses) on derivatives designated as cash flow hedges, net of tax [2] 61 (8) 214
Other      
Intercompany FVOCI investments 0 0  
Accumulated other comprehensive income, end of the period 454 481  
Income tax relating to hedges of net investments in foreign operations of other comprehensive income 0 0 2
Net impact related to cash flow hedges 6 (12) (108)
Income tax relating to net actuarial gains (losses) (7) 5 (4)
Reserve of exchange differences on translation      
Components and changes in accumulated other comprehensive Income (loss)      
Accumulated other comprehensive income, beginning of the period 17 (26)  
Currency translation adjustment      
Losses on translating net assets of foreign operations, net of reclassifications to net earnings, net of tax (59) 84  
Gains (losses) on financial instruments designated as hedges of foreign operations, net of tax 21 (41)  
Other      
Accumulated other comprehensive income, end of the period (21) 17 (26)
Reserve of cash flow hedges [member]      
Components and changes in accumulated other comprehensive Income (loss)      
Accumulated other comprehensive income, beginning of the period 508 562  
Cash flow hedges      
Gains (losses) on derivatives designated as cash flow hedges, net of tax 19 (54)  
Other      
Accumulated other comprehensive income, end of the period 527 508 562
Net impact related to cash flow hedges (6) 12  
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 (29) (44)  
Employee future benefits      
Net actuarial gains (losses) on defined benefit plans, net of tax (26) 15  
Other      
Accumulated other comprehensive income, end of the period (55) (29) (44)
Income tax relating to net actuarial gains (losses) 7 5  
Other reserves [member]      
Components and changes in accumulated other comprehensive Income (loss)      
Accumulated other comprehensive income, beginning of the period (15) (3)  
Other      
Change in ownership of TransAlta Renewables 1 4  
Intercompany FVOCI investments [3] 17    
Intercompany Available-For-Sale Investments   (16)  
Accumulated other comprehensive income, end of the period $ 3 $ (15) $ (3)
[1] (3) Net of income tax expense of nil for the year ended Dec. 31, 2019 (2018 - nil, 2017 - $2 million expense).
[2] (5) Net of income tax expense of $16 million for the year ended Dec. 31, 2019 (2018 - $1 million recovery, 2017 - $77 million recovery).
[3] (1) Refer to Note 28 for details on components of, and changes in, accumulated other comprehensive income (loss).