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Preferred Shares (Tables) | 12 Months Ended
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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 |
Characteristics specific to preferred share series | Characteristics specific to each first preferred share series as at Dec. 31, 2017, are as follows:
Series | Rate during term | Annual dividend rate per share ($) |  | Next Conversion date |  | Rate spread over Benchmark (per cent) | Convertible to Series
A | Fixed | 0.67725 |  | March 31, 2021 |  | 2.03 | B
B | Floating | 0.7255 |  | March 31, 2021 |  | 2.03 | A
C | Fixed | 1.00675 |  | June 30, 2022 |  | 3.10 | D
D | Floating | — |  | — |  | 3.10 | C
E | Fixed | 1.2985 |  | Sept. 30, 2022 |  | 3.65 | F
F | Floating | — |  | — |  | 3.65 | E
G | Fixed | 1.325 |  | Sept. 30, 2019 |  | 3.80 | H
H | Floating | — |  | — |  | 3.80 | G
Disclosure Of Dividends Declared On Preference Shares [Table Text Block] | The following table summarizes the preferred share dividends declared in 2017, 2016, and 2015:
| Total dividends declared ($)
Series | 2017 |  | 2016 |  | 2015 |
A | 5 |  | 10 |  | 14 |
B | 1 |  | 1 |  | — |
C | 9 |  | 16 |  | 13 |
E | 8 |  | 14 |  | 11 |
G | 7 |  | 11 |  | 8 |
Total for the year | 30 |  | 52 |  | 46 |

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