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Other Current Liabilities (Tables)
 12 Months Ended
Dec. 31, 2017
Other Current Liabilities [Abstract]  
Other Current Liabilities [Table Text Block]
Other current liabilities consisted of the following:
As atDecember 31December 31
millions of Canadian dollars 20172016
Accrued charges$ 134$ 137
Accrued interest on long-term debt 78 96
Income tax payable 1 19
Accrued pension liability 41 58
Sales and other taxes payable 11 16
Emission credits obligations (1) 21 10
Other 64 22
$ 350$ 358
(1) Throughout the three-year compliance period associated with the Regional Greenhouse Gas Initiative for carbon dioxide emissions, an obligation is recognized as gas is burned, measured at the cost to acquire credits for the related emissions. Emission credits are capitalized to inventory (note 13) when purchased and subsequently applied against the emission liabilities at the end of each compliance period.