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Common Shares (Tables)
 12 Months Ended
Dec. 31, 2022
Share Capital, Reserves And Other Equity Interest [Abstract]  
Disclosure of issued and outstanding
TransAlta is authorized to issue an unlimited number of voting common shares without nominal or par value.
As at Dec. 3120222021
 
Common
shares
 (millions)
Amount
Common
shares
(millions)
Amount
Issued and outstanding, beginning of year271.0 2,901 269.8 2,896 
Purchased and cancelled under the NCIB(4.3)(46)— — 
Effects of share-based payment plans0.9 5 — (3)
Stock options exercised0.5 3 1.2 8 
Issued and outstanding, end of year268.1 2,863 271.0 2,901 
The following are the effects of the Company's purchase and cancellation of the common shares during the year:
For the year ended Dec. 3120222021
Total shares purchased(1)
4,342,300 — 
Average purchase price per share12.48 — 
Total cost (millions)54 — 
Weighted average book value of shares cancelled46 — 
Amount recorded in deficit(8)— 
(1) As at Dec. 31, 2022, includes 164,300 (2021 – nil) shares that were repurchased but were not cancelled due to timing differences between the transaction date and settlement date. The Company paid $52 million in 2022 and the remaining amount was paid subsequent to the year end.
All preferred shares issued and outstanding are non-voting cumulative redeemable fixed or floating rate first preferred shares.
As at Dec. 3120222021
Series(1)
Number of shares
 (millions)
Amount
Number of shares
(millions)
Amount
Series A9.6 235 9.6 235 
Series B2.4 58 2.4 58 
Series C10.0 243 11.0 269 
Series D1.0 26 — — 
Series E9.0 219 9.0 219 
Series G6.6 161 6.6 161 
Issued and outstanding, end of year38.6 942 38.6 942 
(1)    Series 1 Preferred Shares are accounted for as long-term debt. Refer to Note 26.
Disclosure of earnings per share
Year ended Dec. 31202220212020
Net earnings (loss) attributable to common shareholders4 (576)(336)
Basic and diluted weighted average number of common shares outstanding
  (millions)		271 271 275 
Net earnings (loss) per share attributable to common shareholders,
  basic and diluted
0.01 (2.13)(1.22)