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Commitments and Contingencies (Contractual Obligations) (Details)
$ in Millions
Dec. 31, 2018
CAD ($)
Recorded Unconditional Purchase Obligation [Line Items]  
Contractual Obligation, Due in Next Fiscal Year $ 2,111
Contractual Obligation, Due in Second Year 1,207
Contractual Obligation, Due in Third Year 610
Contractual Obligation, Due in Fourth Year 480
Contractual Obligation, Due in Fifth Year 425
Contractual Obligation, Due after Fifth Year 4,015
Contractual Obligation 8,848
Nova Scotia Power Inc. [Member] | Maritime Link Project [Member]  
Recorded Unconditional Purchase Obligation [Line Items]  
Contractual Obligation, Due in Second Year 111
Purchased Power [Member]  
Recorded Unconditional Purchase Obligation [Line Items]  
Contractual Obligation, Due in Next Fiscal Year 204 [1]
Contractual Obligation, Due in Second Year 203 [1]
Contractual Obligation, Due in Third Year 209 [1]
Contractual Obligation, Due in Fourth Year 208 [1]
Contractual Obligation, Due in Fifth Year 209 [1]
Contractual Obligation, Due after Fifth Year 2,194 [1]
Contractual Obligation 3,227 [1]
Fuel And Gas Supply [Member]  
Recorded Unconditional Purchase Obligation [Line Items]  
Contractual Obligation, Due in Next Fiscal Year 642
Contractual Obligation, Due in Second Year 237
Contractual Obligation, Due in Third Year 49
Contractual Obligation, Due in Fourth Year 7
Contractual Obligation, Due in Fifth Year 3
Contractual Obligation, Due after Fifth Year 0
Contractual Obligation 938
Demand Side Management [Member]  
Recorded Unconditional Purchase Obligation [Line Items]  
Contractual Obligation, Due in Next Fiscal Year 44
Contractual Obligation, Due in Second Year 1
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 45
Transportation [Member]  
Recorded Unconditional Purchase Obligation [Line Items]  
Contractual Obligation, Due in Next Fiscal Year 569 [2],[3]
Contractual Obligation, Due in Second Year 347 [2],[3]
Contractual Obligation, Due in Third Year 255 [2],[3]
Contractual Obligation, Due in Fourth Year 215 [2],[3]
Contractual Obligation, Due in Fifth Year 170 [2],[3]
Contractual Obligation, Due after Fifth Year 1,492 [2],[3]
Contractual Obligation 3,048 [2],[3]
Transportation [Member] | NEGG [Member] | Independent Transmission and Distribution System [Member]  
Recorded Unconditional Purchase Obligation [Line Items]  
Contractual Obligation, Due in Next Fiscal Year 5
Contractual Obligation, Due in Second Year 5
Contractual Obligation, Due in Third Year 5
Contractual Obligation, Due in Fourth Year 4
Contractual Obligation, Due in Fifth Year 4
Contractual Obligation, Due after Fifth Year 59
Contractual Obligation 82
Long-term service agreements [Member]  
Recorded Unconditional Purchase Obligation [Line Items]  
Contractual Obligation, Due in Next Fiscal Year 110 [4],[5]
Contractual Obligation, Due in Second Year 67 [4],[5]
Contractual Obligation, Due in Third Year 42 [4],[5]
Contractual Obligation, Due in Fourth Year 30 [4],[5]
Contractual Obligation, Due in Fifth Year 33 [4],[5]
Contractual Obligation, Due after Fifth Year 246 [4],[5]
Contractual Obligation 528 [4],[5]
Long-term service agreements [Member] | NEGG [Member] | Independent Transmission and Distribution System [Member]  
Recorded Unconditional Purchase Obligation [Line Items]  
Contractual Obligation, Due in Next Fiscal Year 46
Contractual Obligation, Due in Second Year 9
Contractual Obligation, Due in Third Year 24
Contractual Obligation, Due in Fourth Year 16
Contractual Obligation, Due in Fifth Year 16
Contractual Obligation, Due after Fifth Year 137
Contractual Obligation 248
Capital projects [Member]  
Recorded Unconditional Purchase Obligation [Line Items]  
Contractual Obligation, Due in Next Fiscal Year 524 [6]
Contractual Obligation, Due in Second Year 147 [6]
Contractual Obligation, Due in Third Year 45 [6]
Contractual Obligation, Due in Fourth Year 11 [6]
Contractual Obligation, Due in Fifth Year 3 [6]
Contractual Obligation, Due after Fifth Year 8 [6]
Contractual Obligation 738 [6]
Capital projects [Member] | Tampa Electric Division [Member] | Independent Transmission and Distribution System [Member]  
Recorded Unconditional Purchase Obligation [Line Items]  
Contractual Obligation, Due in Next Fiscal Year 439
Equity investment commitments [Member]  
Recorded Unconditional Purchase Obligation [Line Items]  
Contractual Obligation, Due in Next Fiscal Year 0 [7]
Contractual Obligation, Due in Second Year 190 [7]
Contractual Obligation, Due in Third Year 0 [7]
Contractual Obligation, Due in Fourth Year 0 [7]
Contractual Obligation, Due in Fifth Year 0 [7]
Contractual Obligation, Due after Fifth Year 0 [7]
Contractual Obligation 190 [7]
Leases and other [Member]  
Recorded Unconditional Purchase Obligation [Line Items]  
Contractual Obligation, Due in Next Fiscal Year 18 [8]
Contractual Obligation, Due in Second Year 15 [8]
Contractual Obligation, Due in Third Year 10 [8]
Contractual Obligation, Due in Fourth Year 9 [8]
Contractual Obligation, Due in Fifth Year 7 [8]
Contractual Obligation, Due after Fifth Year 75 [8]
Contractual Obligation $ 134 [8]
[1]
Annual requirement to purchase electricity production from independent power producers or other utilities over varying contract lengths.
[2]
Includes $82 million related to NEGG transportation capacity ($5 million in 2019; $5 million in 2020; $5 million in 2021; $4 million in 2022; $4 million in 2023 and $59 million thereafter). On completion of the sale of the NEGG facilities, the remaining future contractual obligations will be transferred to the buyer. Refer to note ##NHFS for additional information.
[3]
Purchasing commitments for transportation of fuel and transportation capacity on various pipelines.
[4]
Includes $248 million related to various long-term service agreements NEGG has entered into for maintenance of certain generating equipment ($46 million in 2019; $9 million in 2020; $24 million in 2021; $16 million in 2022; $16 million in 2023 and $137 million thereafter). On completion of the sale of the NEGG facilities, the remaining future contractual obligations will be transferred to the buyer. Refer to note ##NHFS for additional information.
[5]
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.
[6]
Includes $439 million of commitments related to Tampa Electric's solar and Big Bend Power Station modernization projects.
[7]
Emera has a commitment to make equity contributions to the Labrador Island Link Limited Partnership.
[8]
Operating lease agreements for office space, land, plant fixtures and equipment, telecommunications services, rail cars and vehicles.