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Summary of Realized and Unrealized Gain or (Loss) on Derivative Instruments (Detail) - CAD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Financial Instruments And Derivatives [Line Items]    
Revenues $ 37 $ 0
Purchases of crude oil and products 0 (14)
Total $ 37 $ (14)