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Debt and Capital Structure - Schedule of Short-Term Borrowings (Detail) - CAD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Disclosure of detailed information about borrowings [line items]
Uncommitted demand facilities	$ 0	$ 0
Short-Term Borrowings	48	121
WRB Refining LP
Disclosure of detailed information about borrowings [line items]
Uncommitted demand facilities	48	121
Sunrise Oil Sands Partnership
Disclosure of detailed information about borrowings [line items]
Uncommitted demand facilities	$ 0	$ 0

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The amount of current borrowings. [Refer: Borrowings]

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The amount of undrawn borrowing facilities that may be available for future operating activities and to settle capital commitments. [Refer: Capital commitments]

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