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) |