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Financial Instruments - Additional Information (Detail) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2024 CAD ($)	Dec. 31, 2023 CAD ($)	Dec. 31, 2024 USD ($) Customer	Dec. 31, 2024 CAD ($) Customer	Dec. 31, 2023 USD ($) Customer	Dec. 31, 2023 CAD ($) Customer
Disclosure of detailed information about financial instruments [Line Items]
Number of customers | Customer			0	0	0	0
Percentage concentration risk rate	10.00%
Percentage of change in interest rates	1.00%
Fair value of unsecured senior notes				$ 801		$ 867
Top of range [member]
Disclosure of detailed information about financial instruments [Line Items]
Impact on net income due to changes in interest rate	$ 1	$ 1
Senior Credit Facility [Member]
Disclosure of detailed information about financial instruments [Line Items]
Credit facility amount withdrawn			$ 12		$ 0
Credit Risk [Member] | Most Significant Customer [Member]
Disclosure of detailed information about financial instruments [Line Items]
Trade receivables				$ 36		$ 24

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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 fair value of financial liabilities. [Refer: At fair value [member]; Financial liabilities]

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Percentage concentration risk rate.

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