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Trade Accounts Payable and Other Liabilities - Schedule of Trade Accounts Payable and Other Liabilities (Detail) - CAD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Trade and other payables [abstract]      
Trade accounts payable and accruals $ 1,185 $ 1,111 $ 943
Capital project accruals 201 149 142
Payroll-related liabilities 361 420 252
Accrued interest 102 120 148
Commercial and government royalties 211 296 246
Customer deposits 67 19 18
Current portion of provisions (Note 22(a)) 155 133 71
Settlement payables (Note 28(b)) 45 39 43
Other 6 3 7
Trade account payable and other liabilities $ 2,333 $ 2,290 $ 1,870