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Non-Controlling Interests - Earnings of Subsidiaries with Non-Controlling Interests (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of subsidiaries [line items]      
Revenues $ 2,347 $ 2,249 $ 2,307
Net earnings (loss) 176 (90) (118)
Total comprehensive income (loss) 131 (86) (43)
Amounts attributable to the non-controlling interests:      
Net earnings 94 108 42
Total comprehensive income 77 124 31
TransAlta Renewables      
Disclosure of subsidiaries [line items]      
Revenues 446 462 459
Net earnings (loss) 183 241 13
Total comprehensive income (loss) 138 281 (24)
Amounts attributable to the non-controlling interests:      
Net earnings 73 94 11
Total comprehensive income 56 110 0
Distributions paid to non-controlling interests 69 79 85
TransAlta Cogeneration L.P.      
Disclosure of subsidiaries [line items]      
Revenues 181 185 175
Net earnings (loss) 43 29 61
Total comprehensive income (loss) 43 29 61
Amounts attributable to the non-controlling interests:      
Net earnings 21 14 31
Total comprehensive income 21 14 31
Distributions paid to non-controlling interests $ 37 $ 86 $ 87