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Common Shares (Tables)
 12 Months Ended
Dec. 31, 2017
Share Capital, Reserves And Other Equity Interest [Abstract]  
Issued and outstanding
 TransAlta is authorized to issue an unlimited number of voting common shares without nominal or par value.
As at Dec. 31
2017
2016
 
Common
shares
 (millions)

Amount

Common
shares
(millions)

Amount

Issued and outstanding, beginning of year
287.9

3,095

284.0

3,077

Issued under the dividend reinvestment and share purchase plan
—

—

3.9

18

 
287.9

3,095

287.9

3,095

Amounts receivable under Employee Share Purchase Plan
—

(1
)
—

(1
)
Issued and outstanding, end of year
287.9

3,094

287.9

3,094

All preferred shares issued and outstanding are non-voting cumulative redeemable fixed rate first preferred shares.
As at Dec. 31
2017
2016
Series
Number of shares
 (millions)

Amount

Number of shares
(millions)

Amount

Series A
10.2

248

10.2

248

Series B
1.8

45

1.8

45

Series C
11.0

269

11.0

269

Series E
9.0

219

9.0

219

Series G
6.6

161

6.6

161

Issued and outstanding, end of year
38.6

942

38.6

942
Earnings per share
Year ended Dec. 31
2017

2016

2015

Net earnings (loss) attributable to common shareholders
(190
)
117

(24
)
Basic and diluted weighted average number of common shares outstanding (millions)
288

288

280

Net earnings (loss) per share attributable to common shareholders, basic and diluted
(0.66
)
0.41

(0.09
)