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Other Current Liabilities (Details) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Other Current Liabilities [Abstract]    
Accrued Liabilities, Current $ 154 $ 134
Accrued interest on long-term debt 93 78
Income taxes payable 6 1
Pension and Other Postretirement Defined Benefit Plans, Current Liabilities 31 41
Sales and Excise Tax Payable, Current 9 11
Deferred Emission Credits, Current 8 21
Other Sundry Liabilities, Current 127 64
Other Liabilities, Current, Total $ 428 $ 350