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Non-Controlling Interests - Earnings of Subsidiaries with Non-Controlling Interests (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of subsidiaries [line items]      
Revenues $ 2,101 $ 2,347 $ 2,249
Net earnings (loss) (253) 176 (90)
Total comprehensive income (loss) (355) 131 (86)
Amounts attributable to the non-controlling interests:      
Net earnings (loss) 34 94 108
Total comprehensive income (loss) 84 77 124
TransAlta Renewables Inc.      
Disclosure of subsidiaries [line items]      
Revenues 436 446 462
Net earnings (loss) 97 183 241
Total comprehensive income (loss) 223 138 281
Amounts attributable to the non-controlling interests:      
Net earnings (loss) 40 73 94
Total comprehensive income (loss) 90 56 110
Distributions paid to Canadian Power Holdings Inc. 80 69 79
TransAlta Cogeneration, L.P.      
Disclosure of subsidiaries [line items]      
Revenues 146 181 185
Net earnings (loss) (13) 43 29
Total comprehensive income (loss) (13) 43 29
Amounts attributable to the non-controlling interests:      
Net earnings (loss) (6) 21 14
Total comprehensive income (loss) (6) 21 14
Distributions paid to Canadian Power Holdings Inc. $ 17 $ 37 $ 86