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Interest Expense, Net (Tables) | 12 Months Ended
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Dec. 31, 2017
Interest Income (Expense), Net [Abstract] |
Interest Income and Interest Expense Disclosure [Table Text Block] |
Interest expense, net consisted of the following:
For the | Year ended December 31
millions of Canadian dollars |  | 2017 |  | 2016
Interest on debt | $ | 663 | $ | 443
Beneficial conversion feature (note 10) |  | - |  | 62
Interest on Convertible Debentures (note 10) |  | - |  | 65
Interest on acquisition credit facility related to the TECO Energy acquisition (note 4) |  | - |  | 11
Allowance for borrowed funds used during construction |  | (7) |  | (13)
Other |  | 42 |  | 17
| $ | 698 | $ | 585

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