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Accumulated Other Comprehensive Income (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Components and changes in accumulated other comprehensive Income (loss)      
Accumulated other comprehensive income, beginning of the period $ 454    
Currency translation adjustment      
Losses on translating net assets of foreign operations, net of reclassifications to net earnings, net of tax   $ 38  
Gains (losses) on financial instruments designated as hedges of foreign operations, net of tax 11 21 $ (41)
Cash flow hedges      
Gains (losses) on derivatives designated as cash flow hedges, net of tax [1] 20 61 (8)
Other      
Intercompany FVOCI investments 0 0  
Accumulated other comprehensive income, end of the period 302 454  
Net impact related to cash flow hedges (23) 6 (12)
Income tax relating to net actuarial gains (losses) 3 7 (5)
Reserve of exchange differences on translation      
Components and changes in accumulated other comprehensive Income (loss)      
Accumulated other comprehensive income, beginning of the period (21) 17  
Currency translation adjustment      
Losses on translating net assets of foreign operations, net of reclassifications to net earnings, net of tax (11) (59)  
Gains (losses) on financial instruments designated as hedges of foreign operations, net of tax 11 21  
Other      
Accumulated other comprehensive income, end of the period (21) (21) 17
Reserve of cash flow hedges      
Components and changes in accumulated other comprehensive Income (loss)      
Accumulated other comprehensive income, beginning of the period 527 508  
Cash flow hedges      
Gains (losses) on derivatives designated as cash flow hedges, net of tax (91) 19  
Other      
Accumulated other comprehensive income, end of the period 436 527 508
Net impact related to cash flow hedges 23 6  
Reserve of remeasurements of defined benefit plans      
Components and changes in accumulated other comprehensive Income (loss)      
Accumulated other comprehensive income, beginning of the period (55) (29)  
Employee future benefits      
Net actuarial gains (losses) on defined benefit plans, net of tax (11) (26)  
Other      
Accumulated other comprehensive income, end of the period (66) (55) (29)
Income tax relating to net actuarial gains (losses) (3) (7)  
Other reserves      
Components and changes in accumulated other comprehensive Income (loss)      
Accumulated other comprehensive income, beginning of the period 3 (15)  
Other      
Change in ownership of TransAlta Renewables 0 1  
Intercompany FVOCI investments (50) [2] 17  
Accumulated other comprehensive income, end of the period $ (47) $ 3 $ (15)
[1] Net of income tax expense of $8 million for the year ended Dec. 31, 2020 (2019 —$16 million expense, 2018 — $1 million recovery).
[2] Refer to Note 29 for details on components of, and changes in, accumulated other comprehensive income (loss).