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Interest Expense, Net (Tables)
12 Months Ended
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 theYear ended December 31
millions of Canadian dollars20172016
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