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Financial Instruments - Additional Information (Detail) $ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 CAD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2021 USD ($) Customer | Dec. 31, 2021 CAD ($) Customer | Dec. 31, 2020 USD ($) Customer | Dec. 31, 2020 CAD ($) Customer
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |
Number of customers | Customer |  |  |  |  | 0 | 0
Percentage of change in interest rates | 1.00% |  |  |  |  |
Impact on net income due to changes in interest rate | $ 2 | $ 1 |  |  |  |
Fair value of unsecured senior notes |  |  |  | $ 969 |  | $ 1,023
One Customer [Member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |
Number of customers | Customer |  |  | 1 | 1 | 1 | 1
Percentage concentration risk rate | 10.00% | 12.00% |  |  |  |
Senior Credit Facility [Member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |
Credit facility amount withdrawn |  |  | $ 118 |  | $ 75 |
Real Estate Credit Facility [Member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |
Credit facility amount withdrawn |  |  | $ 11 | $ 31 | $ 11 | $ 13
Credit Risk [Member] |  |  |  |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |  |  |  |
Trade receivables |  |  |  | $ 16 |  | $ 11

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