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Common Stock (Narrative) (Details) CAD / shares in Units, shares in Thousands, CAD in Millions |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Aug. 02, 2016 CAD CAD / shares | Sep. 28, 2015 CAD CAD / shares | Dec. 31, 2016 CAD NumberOfDays shares | Dec. 31, 2015 CAD | Jun. 30, 2016 CAD | Oct. 02, 2015 CAD
Debt Instrument [Line Items] |  |  |  |  |  |
Interest Expense, Debt |  |  | CAD 443.0 | CAD 193.0 |  |
Emera Inc | Convertible Subordinated Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Per Share | CAD / shares | CAD 1,000 |  |  |  |  |
Debt Instrument, Maturity Date | Sep. 29, 2025 |  |  |  |  |
Convertible debenture interest rate | 0.00% |  |  |  |  |
Debt Instrument, Convertible, Conversion Ratio | 23.8949 |  | 0.996 |  |  |
Interest Expense, Debt |  |  | CAD 65.0 |  |  |
Interest Expense Debt After Tax |  |  | CAD 45.0 |  |  |
Debt Instrument, Periodic Payment Terms, Balloon Payment to be Paid |  |  |  |  | CAD 21.0 |
Debt Instrument Periodic Payment Terms Balloon Payment To Be Paid After Tax |  |  |  |  | CAD 14.0 |
Common Stock, Shares, Issued | shares |  |  | 51,990 |  |  |
Common Stock, Conversion Rate |  |  | 95.00% |  |  |
Debt Instrument, Convertible, Threshold Trading Days | NumberOfDays |  |  | 20 |  |  |
TECO Energy Inc [Member] | Emera Inc | Convertible Subordinated Debt [Member] |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt Instrument, Face Amount |  | CAD 1,900.0 |  |  |  |
Debt Instrument, Convertible, Conversion Percent |  | 4.00% |  |  |  |
Debt Instrument, Face Amount, Additional Amount |  |  |  |  |  | CAD 285.0
Aggregate proceeds of the Debenture Offering |  | CAD 2,185.0 |  |  |  |
Debt Instrument, Convertible, Conversion Per Share | CAD / shares |  | CAD 1,000 |  |  |  |
Debt Instrument, Convertible, Conversion Per Share, First Installment | CAD / shares |  | CAD 333 |  |  |  |
Debt Instrument, Convertible, Conversion Per Share, Final Installment | CAD / shares | CAD 667 |  |  |  |  |
Proceeds from Convertible Debt First Installment |  | CAD 727.6 |  |  |  |
Proceeds from Convertible Debt Net of Issuance Costs, First Installment | CAD 1,413.0 | CAD 681.4 |  |  |  |
Proceeds from Convertible Debt , Final Installment | CAD 1,457.0 |  |  |  |  |
Debt Instrument, Convertible, Conversion Price | CAD / shares | CAD 41.85 |  |  |  |  |

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