Average crude oil price.

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Borrowing Facilities, Maximum Borrowing Capacity

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Letters of credit issued as security for performance.

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The debt to capitalization ratio the company cannot exceed under the committed credit facility agreement.

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Target net debt

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Amount of undrawn borrowing facilities that may be available for general purposes.

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Undrawn Borrowing Facilities, Outstanding

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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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The proportion of ownership interest in a joint operation attributable to the entity. [Refer: Joint operations [member]]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The amount of current borrowings. [Refer: Borrowings]

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Debt and Capital Structure - Additional Information (Detail) $ in Millions, $ in Millions	9 Months Ended
	Sep. 30, 2023 CAD ($) $ / bbl	Sep. 30, 2023 USD ($)	Dec. 31, 2022 CAD ($)	Dec. 31, 2022 USD ($)
Disclosure of detailed information about borrowings [line items]
Outstanding letters of credit	$ 353		$ 490
Current borrowings	$ 14		115
Maximum debt to capitalization ratio	65.00%	65.00%
Target net debt	$ 4,000
Average crude oil price \| $ / bbl	45.00
Committed Credit Facilities, Maturing November 10, 2025
Disclosure of detailed information about borrowings [line items]
Credit facilities, maximum borrowing capacity	$ 1,800
Committed Credit Facilities, Maturing November 10, 2026
Disclosure of detailed information about borrowings [line items]
Credit facilities, maximum borrowing capacity	3,700
Committed credit facilities
Disclosure of detailed information about borrowings [line items]
Undrawn borrowing facilities, outstanding	0		0
Uncommitted Demand Facility
Disclosure of detailed information about borrowings [line items]
Current borrowings	0		0
WRB Refining LP
Disclosure of detailed information about borrowings [line items]
Current borrowings	$ 14		115
Proportion of ownership interest in joint operation	50.00%
Undrawn borrowing facilities, outstanding		$ 20
WRB Refining LP \| Cenovus Energy Inc
Disclosure of detailed information about borrowings [line items]
Undrawn borrowing facilities, outstanding	$ 14	10	115	$ 85
Maximum
Disclosure of detailed information about borrowings [line items]
Credit facilities, maximum borrowing capacity	1,700		$ 1,900
Maximum \| Maximum
Disclosure of detailed information about borrowings [line items]
Amount of undrawn facilities for general purposes	$ 1,400
Maximum \| WRB Refining LP
Disclosure of detailed information about borrowings [line items]
Credit facilities, maximum borrowing capacity		$ 450
Maximum \| WRB Refining LP \| Cenovus Energy Inc
Disclosure of detailed information about borrowings [line items]
Credit facilities, maximum borrowing capacity				$ 225