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Accounts Payable and Accrued Liabilities - Schedule of Accounts Payable and Accrued Liabilities (Detail) - CAD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Trade And Other Current Payables [Abstract] |  |
Accruals | $ 912 | $ 1,085
Trade | 608 | 954
Interest | 77 | 49
Partner Advances | 175 | 16
Employee Long-Term Incentives | 130 | 60
Joint Operations Payable | 6 | 2
Risk Management | 58 | 2
Onerous Contract Provisions | 26 | 17
Other | 26 | 44
Accounts payable and accrued liabilities | $ 2,018 | $ 2,229

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