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accounts payable and accrued liabilities (Details) - CAD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
accounts payable and accrued liabilities    
Accrued liabilities $ 1,251 $ 1,091
Payroll and other employee-related liabilities 545 422
Restricted share units liability 18 77
Total 1,814 1,590
Trade accounts payable 855 892
Interest payable 173 160
Indirect taxes payable and other 120 107
Total $ 2,962 $ 2,749