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Other Current Liabilities (Details) - CAD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Other Current Liabilities [Abstract]    
Accrued Liabilities, Current $ 134 $ 137
Accrued interest on long-term debt 78 96
Income taxes payable 1 19
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities 41 58
Sales and Excise Tax Payable, Current 11 16
Deferred Emission Credits, Current 21 10
Other Sundry Liabilities, Current 64 22
Other Liabilities, Current, Total $ 350 $ 358