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Commitments and Contingencies (Contractual Obligations) (Details)
$ in Millions
Dec. 31, 2017
CAD ($)
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.