XML 141 R113.htm IDEA: XBRL DOCUMENT v3.10.0.1
Non-Controlling Interests - Earnings of Subsidiaries with Non-Controlling Interests (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of subsidiaries [line items]      
Revenues $ 2,249 $ 2,307 $ 2,397
Net earnings (loss) (90) (118) 276
Total comprehensive income (86) (43) 361
Amounts attributable to the non-controlling interests:      
Net earnings 108 42 107
Total comprehensive income 124 31 146
Distributions paid to non-controlling interests (180) (172)  
TransAlta Renewables      
Disclosure of subsidiaries [line items]      
Revenues 462 459 259
Net earnings (loss) 241 13 1
Total comprehensive income 281 (24) 40
Amounts attributable to the non-controlling interests:      
Net earnings 94 11 2
Total comprehensive income 110 0 18
Distributions paid to non-controlling interests 79 85 83
TransAlta Cogeneration L.P.      
Disclosure of subsidiaries [line items]      
Revenues 185 175 274
Net earnings (loss) 29 61 211
Total comprehensive income 29 61 258
Amounts attributable to the non-controlling interests:      
Net earnings 14 31 105
Total comprehensive income 14 31 128
Distributions paid to non-controlling interests $ 86 $ 87 $ 68