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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2017
Commitments and Contingencies [Abstract]  
Other Commitments [Table Text Block]
millions of Canadian dollars20182019202020212022ThereafterTotal
Purchased power (1)$ 234$ 216$ 212$ 209$ 206$ 2,148$ 3,225
Transportation (2) 451 298 264 184 172 1,339 2,708
Fuel and gas supply 527 176 50 41 - - 794
Capital projects 413 88 - - - - 501
Long-term service agreements (3) 75 65 34 44 35 180 433
Equity investment commitments (4) 15 5 190 - - - 210
DSM 63 28 18 18 18 - 145
Leases and other (5) 43 12 10 7 4 61 137
$ 1,821$ 888$ 778$ 503$ 435$ 3,728$ 8,153
(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.