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Accumulated Other Comprehensive Loss (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Components and changes in accumulated other comprehensive Income (loss)      
Accumulated other comprehensive income, beginning of the period $ (222)    
Currency translation adjustment      
(Losses) gains on translating net assets of foreign operations, net of reclassifications to net earnings, net of tax (3) $ 4  
Gains (losses) on financial instruments designated as hedges of foreign operations, net of reclassifications to net earnings, net of tax [1] 9 (25) $ 0
Cash flow hedges      
Gains (losses) on derivatives designated as cash flow hedges, net of reclassifications to net earnings and to non-financial assets, net of tax [2] 41 (556) (200)
Other      
Intercompany and third-party investments at FVTOCI 0 (1)  
Accumulated other comprehensive income, end of the period (164) (222)  
Net income tax expense (recovery) relating to gains (losses) on financial instruments 1 (3) 0
Net impact related to cash flow hedges 27 (112) (57)
Net of income tax expense 1 (12) (11)
Currency translation adjustment      
Components and changes in accumulated other comprehensive Income (loss)      
Accumulated other comprehensive income, beginning of the period (39) (35)  
Currency translation adjustment      
(Losses) gains on translating net assets of foreign operations, net of reclassifications to net earnings, net of tax (6) 21  
Gains (losses) on financial instruments designated as hedges of foreign operations, net of reclassifications to net earnings, net of tax 9 (25)  
Other      
Accumulated other comprehensive income, end of the period (36) (39) (35)
Cash flow hedges      
Components and changes in accumulated other comprehensive Income (loss)      
Accumulated other comprehensive income, beginning of the period (228) 228  
Cash flow hedges      
Gains (losses) on derivatives designated as cash flow hedges, net of reclassifications to net earnings and to non-financial assets, net of tax 99 (456)  
Other      
Accumulated other comprehensive income, end of the period (129) (228) 228
Net impact related to cash flow hedges (27) 112  
Employee future benefits      
Components and changes in accumulated other comprehensive Income (loss)      
Accumulated other comprehensive income, beginning of the period 8 (29)  
Employee future benefits      
Net actuarial gains on defined benefit plans, net of tax (5) 37  
Other      
Accumulated other comprehensive income, end of the period 3 8 (29)
Net of income tax expense (1) 12  
Other      
Components and changes in accumulated other comprehensive Income (loss)      
Accumulated other comprehensive income, beginning of the period 37 (18)  
Other      
Change in ownership of TransAlta Renewables (64)    
Intercompany and third-party investments at FVTOCI 25 55  
Accumulated other comprehensive income, end of the period $ (2) $ 37 $ (18)
[1] Net of income tax expense of $1 million for the year ended Dec. 31, 2023 (2022 – $3 million recovery, 2021 – nil).
[2] Net of income tax expense of $10 million for the year ended Dec. 31, 2023 (2022 – $138 million recovery, 2021 – $55 million recovery).