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Non-Controlling Interests - Earnings of Subsidiaries with Non-Controlling Interests (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of subsidiaries [line items]      
Revenues $ 2,721 $ 2,101 $ 2,347
Net earnings (loss) (425) (253) 176
Total comprehensive earnings (loss) (610) (355) 131
Amounts attributable to the non-controlling interests:      
Net earnings (loss) 112 34 94
Total comprehensive earnings (loss) 83 84 77
TransAlta Renewables Inc.      
Disclosure of subsidiaries [line items]      
Revenues 470 436 446
Net earnings (loss) 139 97 183
Total comprehensive earnings (loss) 66 223 138
Amounts attributable to the non-controlling interests:      
Net earnings (loss) 50 40 73
Total comprehensive earnings (loss) 21 90 56
Distributions paid to Canadian Power Holdings Inc. 100 80 69
TransAlta Cogeneration, L.P.      
Disclosure of subsidiaries [line items]      
Revenues 265 146 181
Net earnings (loss) 103 (13) 43
Total comprehensive earnings (loss) 103 (13) 43
Amounts attributable to the non-controlling interests:      
Net earnings (loss) 62 (6) 21
Total comprehensive earnings (loss) 62 (6) 21
Distributions paid to Canadian Power Holdings Inc. $ 56 $ 17 $ 37