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Common Shares (Tables) | 12 Months Ended
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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. 31 | 2022 |  | 2021
| Common shares (millions) | Amount |  | Common shares (millions) | Amount
Issued and outstanding, beginning of year | 271.0 |  | 2,901 |  |  | 269.8 |  | 2,896 |
Purchased and cancelled under the NCIB | (4.3) |  | (46) |  |  | — |  | — |
Effects of share-based payment plans | 0.9 |  | 5 |  |  | — |  | (3) |
Stock options exercised | 0.5 |  | 3 |  |  | 1.2 |  | 8 |
Issued and outstanding, end of year | 268.1 |  | 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. 31 | 2022 | 2021
Total shares purchased(1) | 4,342,300 |  | — |
Average purchase price per share | 12.48 |  | — |
Total cost (millions) | 54 |  | — |
Weighted average book value of shares cancelled | 46 |  | — |
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. 31 | 2022 |  | 2021
Series(1) | Number of shares (millions) | Amount |  | Number of shares (millions) | Amount
Series A | 9.6 |  | 235 |  |  | 9.6 |  | 235 |
Series B | 2.4 |  | 58 |  |  | 2.4 |  | 58 |
Series C | 10.0 |  | 243 |  |  | 11.0 |  | 269 |
Series D | 1.0 |  | 26 |  |  | — |  | — |
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 |
(1) Series 1 Preferred Shares are accounted for as long-term debt. Refer to Note 26.
Disclosure of earnings per share |
Year ended Dec. 31 | 2022 | 2021 | 2020
Net earnings (loss) attributable to common shareholders | 4 |  | (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) |

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