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Commitments and Contingencies (Contractual Obligations) (Details) $ in Millions | Dec. 31, 2017 CAD ($)
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Recorded Unconditional Purchase Obligation [Line Items] |  |
Contractual Obligation, Due in Next Fiscal Year | $ 1,821 |
Contractual Obligation, Due in Second Year | 888 |
Contractual Obligation, Due in Third Year | 778 |
Contractual Obligation, Due in Fourth Year | 503 |
Contractual Obligation, Due in Fifth Year | 435 |
Contractual Obligation, Due after Fifth Year | 3,728 |
Contractual Obligation | 8,153 |
Nova Scotia Power Inc. [Member] | Maritime Link Project [Member] |  |
Recorded Unconditional Purchase Obligation [Line Items] |  |
Contractual Obligation, Due in Next Fiscal Year | 110 |
Contractual Obligation, Due in Second Year | 111 |
Purchased Power [Member] |  |
Recorded Unconditional Purchase Obligation [Line Items] |  |
Contractual Obligation, Due in Next Fiscal Year | 234 | [1]
Contractual Obligation, Due in Second Year | 216 | [1]
Contractual Obligation, Due in Third Year | 212 | [1]
Contractual Obligation, Due in Fourth Year | 209 | [1]
Contractual Obligation, Due in Fifth Year | 206 | [1]
Contractual Obligation, Due after Fifth Year | 2,148 | [1]
Contractual Obligation | 3,225 | [1]
Fuel And Gas Supply [Member] |  |
Recorded Unconditional Purchase Obligation [Line Items] |  |
Contractual Obligation, Due in Next Fiscal Year | 527 |
Contractual Obligation, Due in Second Year | 176 |
Contractual Obligation, Due in Third Year | 50 |
Contractual Obligation, Due in Fourth Year | 41 |
Contractual Obligation, Due in Fifth Year | 0 |
Contractual Obligation, Due after Fifth Year | 0 |
Contractual Obligation | 794 |
Demand Side Management [Member] |  |
Recorded Unconditional Purchase Obligation [Line Items] |  |
Contractual Obligation, Due in Next Fiscal Year | 63 |
Contractual Obligation, Due in Second Year | 28 |
Contractual Obligation, Due in Third Year | 18 |
Contractual Obligation, Due in Fourth Year | 18 |
Contractual Obligation, Due in Fifth Year | 18 |
Contractual Obligation, Due after Fifth Year | 0 |
Contractual Obligation | 145 |
Transportation [Member] |  |
Recorded Unconditional Purchase Obligation [Line Items] |  |
Contractual Obligation, Due in Next Fiscal Year | 451 | [2]
Contractual Obligation, Due in Second Year | 298 | [2]
Contractual Obligation, Due in Third Year | 264 | [2]
Contractual Obligation, Due in Fourth Year | 184 | [2]
Contractual Obligation, Due in Fifth Year | 172 | [2]
Contractual Obligation, Due after Fifth Year | 1,339 | [2]
Contractual Obligation | 2,708 | [2]
Long-term service agreements [Member] |  |
Recorded Unconditional Purchase Obligation [Line Items] |  |
Contractual Obligation, Due in Next Fiscal Year | 75 | [3]
Contractual Obligation, Due in Second Year | 65 | [3]
Contractual Obligation, Due in Third Year | 34 | [3]
Contractual Obligation, Due in Fourth Year | 44 | [3]
Contractual Obligation, Due in Fifth Year | 35 | [3]
Contractual Obligation, Due after Fifth Year | 180 | [3]
Contractual Obligation | 433 | [3]
Capital projects [Member] |  |
Recorded Unconditional Purchase Obligation [Line Items] |  |
Contractual Obligation, Due in Next Fiscal Year | 413 |
Contractual Obligation, Due in Second Year | 88 |
Contractual Obligation, Due in Third Year | 0 |
Contractual Obligation, Due in Fourth Year | 0 |
Contractual Obligation, Due in Fifth Year | 0 |
Contractual Obligation, Due after Fifth Year | 0 |
Contractual Obligation | 501 |
Equity investment commitments [Member] |  |
Recorded Unconditional Purchase Obligation [Line Items] |  |
Contractual Obligation, Due in Next Fiscal Year | 15 | [4]
Contractual Obligation, Due in Second Year | 5 | [4]
Contractual Obligation, Due in Third Year | 190 | [4]
Contractual Obligation, Due in Fourth Year | 0 | [4]
Contractual Obligation, Due in Fifth Year | 0 | [4]
Contractual Obligation, Due after Fifth Year | 0 | [4]
Contractual Obligation | 210 | [4]
Leases and other [Member] |  |
Recorded Unconditional Purchase Obligation [Line Items] |  |
Contractual Obligation, Due in Next Fiscal Year | 43 | [5]
Contractual Obligation, Due in Second Year | 12 | [5]
Contractual Obligation, Due in Third Year | 10 | [5]
Contractual Obligation, Due in Fourth Year | 7 | [5]
Contractual Obligation, Due in Fifth Year | 4 | [5]
Contractual Obligation, Due after Fifth Year | 61 | [5]
Contractual Obligation | $ 137 | [5]
[1] | Annual requirement to purchase electricity production from independent power producers or other utilities over varying contract lengths.
[2] | Purchasing commitments for transportation of fuel and transportation capacity on various pipelines.
[3] | Maintenance of certain generating equipment, services related to a generation facility and wind operating agreements, outsourced management of computer and communication infrastructure and vegetation management.
[4] | Emera has a commitment in connection with the Federal Loan Guarantee to complete construction of the Maritime Link. Thirty per cent of the financing of this project will come from Emera as equity. Emera also has a commitment to make equity contributions to the Labrador Island Link Limited Partnership upon draw requests from the general partner. The amounts forecasted are a combination of equity investments for both projects and are subject to change in both timing and amounts as the projects advance through construction.
[5] | Operating lease agreements for office space, land, plant fixtures and equipment, telecommunications services, rail cars and vehicles.

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