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Long Term Debt (Long Term Maturities) (Details) $ in Millions | Dec. 31, 2017 CAD ($)
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Debt Instrument [Line Items] |
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2018 | $ 741
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2019 | 1,105
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2020 | 646
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2021 | 2,204
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2022 | 468
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal Thereafter | 8,784
Total debt maturities including current portion | 13,948
Emera Inc |
Debt Instrument [Line Items] |
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2018 | 0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2019 | 225
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2020 | 133
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2021 | 0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2022 | 0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal Thereafter | 2,005
Total debt maturities including current portion | 2,363
Emera US Finance LP [Member] |
Debt Instrument [Line Items] |
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2018 | 0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2019 | 627
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2020 | 0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2021 | 941
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2022 | 0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal Thereafter | 2,509
Total debt maturities including current portion | 4,077
TECO Finance, Inc. [Member] |
Debt Instrument [Line Items] |
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2018 | 314
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2019 | 0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2020 | 376
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2021 | 0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2022 | 0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal Thereafter | 0
Total debt maturities including current portion | 690
Emera Maine [Member] |
Debt Instrument [Line Items] |
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2018 | 6
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2019 | 51
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2020 | 37
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2021 | 0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2022 | 113
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal Thereafter | 201
Total debt maturities including current portion | 408
Nova Scotia Power Inc. [Member] |
Debt Instrument [Line Items] |
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2018 | 0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2019 | 95
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2020 | 0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2021 | 364
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2022 | 0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal Thereafter | 1,965
Total debt maturities including current portion | 2,424
EBP [Member] |
Debt Instrument [Line Items] |
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2018 | 0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2019 | 0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2020 | 0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2021 | 248
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2022 | 0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal Thereafter | 0
Total debt maturities including current portion | 248
Grand Bahama Power Company Limited [Member] |
Debt Instrument [Line Items] |
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2018 | 12
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2019 | 15
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2020 | 45
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2021 | 22
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2022 | 31
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal Thereafter | 41
Total debt maturities including current portion | 166
The Barbados Light and Power Company Limited [Member] |
Debt Instrument [Line Items] |
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2018 | 28
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2019 | 29
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2020 | 55
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2021 | 28
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2022 | 11
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal Thereafter | 93
Total debt maturities including current portion | 244
Tampa Electric Division [Member] |
Debt Instrument [Line Items] |
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2018 | 319
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2019 | 0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2020 | 0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2021 | 291
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2022 | 282
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal Thereafter | 1,518
Total debt maturities including current portion | 2,410
New Mexico Gas Company [Member] |
Debt Instrument [Line Items] |
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2018 | 0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2019 | 0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2020 | 0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2021 | 251
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2022 | 0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal Thereafter | 88
Total debt maturities including current portion | 339
Peoples Gas System Division [Member] |
Debt Instrument [Line Items] |
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2018 | 62
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2019 | 0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2020 | 0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2021 | 59
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2022 | 31
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal Thereafter | 176
Total debt maturities including current portion | 328
New Mexico Gas Incorporate [Member] |
Debt Instrument [Line Items] |
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2018 | 0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2019 | 63
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2020 | 0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2021 | 0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal in 2022 | 0
Long-term Debt and Capital Lease Obligations, Maturities, Repayments of Principal Thereafter | 188
Total debt maturities including current portion | $ 251

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