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Non-Controlling Interests - Earnings of Subsidiaries with Non-Controlling Interests (Details) - CAD
CAD in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of subsidiaries [line items]      
Revenues CAD 2,307 CAD 2,397 CAD 2,267
Net earnings (loss) (118) 276 116
Total comprehensive income (43) 361 375
Amounts attributable to the non-controlling interests:      
Net earnings 42 107 94
Total comprehensive income 31 146 103
Distributions paid to non-controlling interests (172) (161)  
TransAlta Renewables      
Disclosure of subsidiaries [line items]      
Revenues 459 259 236
Net earnings (loss) 13 1 198
Total comprehensive income (24) 40 204
Amounts attributable to the non-controlling interests:      
Net earnings 11 2 63
Total comprehensive income 0 18 65
Distributions paid to non-controlling interests 85 83 43
TransAlta Cogeneration L.P.      
Disclosure of subsidiaries [line items]      
Revenues 175 274 288
Net earnings (loss) 61 211 61
Total comprehensive income 61 258 77
Amounts attributable to the non-controlling interests:      
Net earnings 31 105 31
Total comprehensive income 31 128 38
Distributions paid to non-controlling interests CAD 87 CAD 68 CAD 56