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Other Current Liabilities
 12 Months Ended
Dec. 31, 2018
Other Current Liabilities [Abstract]  
OTHER CURRENT LIABILITIES

23. OTHER CURRENT LIABILITIES

Other current liabilities consisted of the following:
As atDecember 31December 31
millions of Canadian dollars 20182017
Accrued charges$ 154$ 134
Accrued interest on long-term debt 93 78
Pension and post-retirement liabilities (note 19) 31 41
Sales and other taxes payable 9 11
Emission credits obligations (1) 8 21
Income tax payable 6 1
Other 127 64
$ 428$ 350
(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 11) when purchased and subsequently applied against the emission liabilities at the end of each compliance period.