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Trade Accounts Payable and Other Liabilities - Schedule of Trade Accounts Payable and Other Liabilities (Detail) - CAD
CAD in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Trade and other payables [abstract]    
Trade accounts payable and accruals CAD 1,150 CAD 986
Capital project accruals 149 142
Payroll-related liabilities 420 252
Accrued interest 120 148
Commercial and government royalties 296 246
Customer deposits 19 18
Current portion of provisions (Note 22(a)) 133 71
Current portion of deferred consideration (Note 20) 23 32
Other 3 7
Trade account payable and other liabilities CAD 2,313 CAD 1,902