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Financial Instruments - Reconciliation of Changes in the Fair Value of Available for Sale Financial Assets (Detail)
$ in Millions
6 Months Ended
Jun. 30, 2022
CAD ($)
Disclosure of fair value measurement of assets [Line Items]  
Fair value, beginning of year $ 48
Fair value, end of year 34
Level 3 of fair value hierarchy  
Disclosure of fair value measurement of assets [Line Items]  
Fair value, beginning of year 53
Change in Fair Value 0
Fair value, end of year $ 53