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Financial Instruments - Additional information (Detail) $ in Millions | Dec. 31, 2021 CAD ($) $ / bbl | Dec. 31, 2020 CAD ($) | Dec. 31, 2019 CAD ($)
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Disclosure of detailed information about financial instruments [line items] |  |  |
Long-Term Debt | $ 12,385 | $ 7,441 |
Cash collateral for risk management contracts price change | $ 114 | 59 |
Discounted credit adjusted risk free rate | 2.90% |  |
Estimated fair value of contingent payment | $ 236 | 63 | $ 143
WCS Forward Prices |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Average forward price for Western Canadian Select Crude Oil for the remaining term (in CAD per barrel) | $ / bbl | 77.87 |  |
WTI Option Implied Volatility |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Average implied volatility contingent payment percentage | 39.50% |  |
U.S. to Canadian Dollar Foreign Exchange Average Rate Volatility Contingent Payment |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Average implied volatility contingent payment percentage | 6.40% |  |
Level 2 of fair value hierarchy |  |  |
Disclosure of detailed information about financial instruments [line items] |  |  |
Debt, fair value | $ 13,700 | $ 8,600 |

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