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Commitments and Contingencies (Contractual Obligations) (Details)
CAD in Millions
Dec. 31, 2016
CAD
Recorded Unconditional Purchase Obligation [Line Items]  
Contractual Obligation, Due in Next Fiscal Year CAD 1,793
Contractual Obligation, Due in Second Year 897
Contractual Obligation, Due in Third Year 719
Contractual Obligation, Due in Fourth Year 766
Contractual Obligation, Due in Fifth Year 466
Contractual Obligation, Due after Fifth Year 4,191
Contractual Obligation 8,832
Purchased Power [Member]  
Recorded Unconditional Purchase Obligation [Line Items]  
Contractual Obligation, Due in Next Fiscal Year 253 [1]
Contractual Obligation, Due in Second Year 224 [1]
Contractual Obligation, Due in Third Year 206 [1]
Contractual Obligation, Due in Fourth Year 202 [1]
Contractual Obligation, Due in Fifth Year 198 [1]
Contractual Obligation, Due after Fifth Year 2,272 [1]
Contractual Obligation 3,355 [1]
Fuel And Gas Supply [Member]  
Recorded Unconditional Purchase Obligation [Line Items]  
Contractual Obligation, Due in Next Fiscal Year 475
Contractual Obligation, Due in Second Year 161
Contractual Obligation, Due in Third Year 109
Contractual Obligation, Due in Fourth Year 28
Contractual Obligation, Due in Fifth Year 22
Contractual Obligation, Due after Fifth Year 0
Contractual Obligation 795
Demand Side Management [Member]  
Recorded Unconditional Purchase Obligation [Line Items]  
Contractual Obligation, Due in Next Fiscal Year 42
Contractual Obligation, Due in Second Year 48
Contractual Obligation, Due in Third Year 13
Contractual Obligation, Due in Fourth Year 0
Contractual Obligation, Due in Fifth Year 0
Contractual Obligation, Due after Fifth Year 0
Contractual Obligation 103
Transportation [Member]  
Recorded Unconditional Purchase Obligation [Line Items]  
Contractual Obligation, Due in Next Fiscal Year 496 [2]
Contractual Obligation, Due in Second Year 392 [2]
Contractual Obligation, Due in Third Year 310 [2]
Contractual Obligation, Due in Fourth Year 280 [2]
Contractual Obligation, Due in Fifth Year 196 [2]
Contractual Obligation, Due after Fifth Year 1,622 [2]
Contractual Obligation 3,296 [2]
Long-term service agreements [Member]  
Recorded Unconditional Purchase Obligation [Line Items]  
Contractual Obligation, Due in Next Fiscal Year 92 [3]
Contractual Obligation, Due in Second Year 55 [3]
Contractual Obligation, Due in Third Year 67 [3]
Contractual Obligation, Due in Fourth Year 44 [3]
Contractual Obligation, Due in Fifth Year 42 [3]
Contractual Obligation, Due after Fifth Year 227 [3]
Contractual Obligation 527 [3]
Capital projects [Member]  
Recorded Unconditional Purchase Obligation [Line Items]  
Contractual Obligation, Due in Next Fiscal Year 133
Contractual Obligation, Due in Second Year 0
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 133
Equity investment commitments [Member]  
Recorded Unconditional Purchase Obligation [Line Items]  
Contractual Obligation, Due in Next Fiscal Year 236 [4]
Contractual Obligation, Due in Second Year 0 [4]
Contractual Obligation, Due in Third Year 0 [4]
Contractual Obligation, Due in Fourth Year 200 [4]
Contractual Obligation, Due in Fifth Year 0 [4]
Contractual Obligation, Due after Fifth Year 0 [4]
Contractual Obligation 436 [4]
Leases and other [Member]  
Recorded Unconditional Purchase Obligation [Line Items]  
Contractual Obligation, Due in Next Fiscal Year 66 [5]
Contractual Obligation, Due in Second Year 17 [5]
Contractual Obligation, Due in Third Year 14 [5]
Contractual Obligation, Due in Fourth Year 12 [5]
Contractual Obligation, Due in Fifth Year 8 [5]
Contractual Obligation, Due after Fifth Year 70 [5]
Contractual Obligation CAD 187 [5]
[1]
Annual requirement to purchase electricity production from independent power producers 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 ("FLG") 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.