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Non-Controlling Interests - Earnings of Subsidiaries with Non-Controlling Interests (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of subsidiaries [line items]      
Revenues $ 2,976 $ 2,721 $ 2,101
Net earnings (loss) 161 (425) (253)
Total comprehensive income (loss) (263) (610) (355)
Amounts attributable to the non-controlling interests:      
Net earnings (loss) 111 112 34
Total comprehensive income (loss) 55 83 84
TransAlta Renewables Inc.      
Disclosure of subsidiaries [line items]      
Revenues 560 470 436
Net earnings (loss) 74 139 97
Total comprehensive income (loss) (67) 66 223
Amounts attributable to the non-controlling interests:      
Net earnings (loss) 20 50 40
Total comprehensive income (loss) (36) 21 90
Dividends paid to non-controlling interests 100 100 80
TransAlta Cogeneration, L.P.      
Disclosure of subsidiaries [line items]      
Revenues 347 265 146
Net earnings (loss) 143 103 (13)
Total comprehensive income (loss) 143 103 (13)
Amounts attributable to the non-controlling interests:      
Net earnings (loss) 91 62 (6)
Total comprehensive income (loss) 91 62 (6)
Dividends paid to non-controlling interests $ 87 $ 56 $ 17