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Financial Instruments - Additional Information (Detail) $ in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022 CAD ($)	Dec. 31, 2021 CAD ($)	Dec. 31, 2022 USD ($) Customer	Dec. 31, 2022 CAD ($) Customer	Dec. 31, 2021 USD ($) Customer	Dec. 31, 2021 CAD ($) Customer
Disclosure of detailed information about financial instruments [Line Items]
Number of customers | Customer			0	0
Percentage concentration risk rate	10.00%
Percentage of change in interest rates	1.00%
Impact on net income due to changes in interest rate	$ 1	$ 2
Fair value of unsecured senior notes				$ 965		$ 969
One Customer [Member]
Disclosure of detailed information about financial instruments [Line Items]
Number of customers | Customer					1	1
Percentage concentration risk rate		10.00%
Senior Credit Facility [Member]
Disclosure of detailed information about financial instruments [Line Items]
Credit facility amount withdrawn			$ 44		$ 118
Real Estate Credit Facility [Member]
Disclosure of detailed information about financial instruments [Line Items]
Credit facility amount withdrawn				30		$ 31
Credit Risk [Member]
Disclosure of detailed information about financial instruments [Line Items]
Trade receivables				$ 24		$ 16

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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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The amount that best represents the maximum exposure to credit risk without taking into account any collateral held or other credit enhancements (for example, netting agreements that do not qualify for offset in accordance with IAS 32). [Refer: Credit risk [member]]

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Impact on net income due to changes in interest rate.

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Percentage concentration risk rate.

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Percentage of change in interest rates.

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