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Common Stock (Tables) | 12 Months Ended
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Dec. 31, 2017
Common Stock [Abstract] |
Schedule of Common Stock Outstanding Roll Forward [Table Text Block] |
Authorized: Unlimited number of non-par value common shares. |  |  |  |  |  |
| 2017 |  | 2016
Issued and outstanding: | millions of shares | millions of Canadian dollars |  | millions of shares | millions of Canadian dollars
Balance, December 31, 2016 | 210.02 | $ | 4,738 |  | 147.21 | $ | 2,157
Conversion of Convertible Debentures (1) | 0.15 |  | 6 |  | 51.99 |  | 2,115
Issuance of common stock (2) | 14.61 |  | 680 |  | 7.69 |  | 338
Issued for cash under Purchase Plans at market rate | 3.89 |  | 182 |  | 2.51 |  | 115
Discount on shares purchased under Dividend Reinvestment Plan | - |  | (9) |  | - |  | (5)
Options exercised under senior management share option plan | 0.10 |  | 3 |  | 0.62 |  | 17
Employee share purchase plan | - |  | 1 |  | - |  | 1
Balance, December 31 2017 | 228.77 | $ | 5,601 |  | 210.02 | $ | 4,738
(1) As at December 31, 2017, a total of 52.14 million common shares of the Company were issued, representing conversion into common shares of more than 99.9% of the Convertible Debentures.
(2) On December 28, 2017, Emera completed an offering of 14.6 million common shares, at $47.90 per common share, for gross proceeds of approximately $700 million. The net proceeds were $680 million after $20 million of issuance costs, net of taxes.

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- Definition Tabular disclosure of the change in common stock outstanding. + References No definition available. + Details
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