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Consolidated Statements of Earnings (Loss) Statement - CAD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Profit or loss [abstract]      
Revenues (Note 5) $ 2,249 $ 2,307 $ 2,397
Fuel and purchased power (Note 6) 1,100 1,016 963
Gross margin 1,149 1,291 1,434
Operations, maintenance and administration (Note 6) 515 517 489
Depreciation and amortization 574 635 601
Asset impairment charges (reversals) (Note 7) 73 20 28
Taxes, other than income taxes 31 30 31
Net other operating expense (income) (Note 9) (204) (49) (193)
Operating income 160 138 478
Finance lease income 8 54 66
Net interest expense (Note 10) (250) (247) (229)
Foreign exchange gain (loss) (15) (1) (5)
Gain on sale of assets and other 1 2 4
Earnings (loss) before income taxes (96) (54) 314
Income tax expense (recovery) (Note 11) (6) 64 38
Net earnings (loss) (90) (118) 276
Net earnings (loss) attributable to:      
TransAlta shareholders (198) (160) 169
Non-controlling interests (Note 12) 108 42 107
Preferred share dividends (Note 25) 50 30 52
Net earnings (loss) attributable to common shareholders $ (248) $ (190) $ 117
Weighted average number of common shares outstanding in the year (millions) 287 288 288
Net earnings (loss) per share attributable to common shareholders, basic and diluted (Note 24) $ (0.86) $ (0.66) $ 0.41