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Common Shares (Tables)
 12 Months Ended
Dec. 31, 2018
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
2018
2017
 
Common
shares
 (millions)

Amount

Common
shares
(millions)

Amount

Issued and outstanding, beginning of year
287.9

3,094

287.9

3,095

Purchased and cancelled under the NCIB
(3.3
)
(35
)
—

—

 
284.6

3,059

287.9

3,095

Amounts receivable under Employee Share Purchase Plan
—

—

—

(1
)
Issued and outstanding, end of year
284.6

3,059

287.9

3,094

The following are the effects of the Corporation's purchase and cancellation of the common shares during the year ended Dec. 31, 2018:
Total shares purchased(1)
 
 
3,264,500

Average purchase price per share
 
 
$
7.02

Total cost
 
 
23

Weighted average book value of shares cancelled
 
 
35

Increase to retained earnings
 
 
12

All preferred shares issued and outstanding are non-voting cumulative redeemable fixed rate first preferred shares.
As at Dec. 31
2018
2017
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
2018

2017

2016

Net earnings (loss) attributable to common shareholders
(248
)
(190
)
117

Basic and diluted weighted average number of common shares outstanding (millions)
287

288

288

Net earnings (loss) per share attributable to common shareholders, basic and diluted
(0.86
)
(0.66
)
0.41