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Financial Instruments - Additional information (Detail) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 CAD ($) $ / bbl | Dec. 31, 2019 CAD ($) | Dec. 31, 2018 CAD ($)
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Long-term debt, carrying value | $ 7,441 | $ 6,699 |
Cash collateral for risk management contracts price change | $ 59 |  |
Discounted Credit adjusted risk free rate | 2.00% |  |
Estimated fair value of contingent payment | $ 63 | 143 | $ 132
WCS Forward Prices [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Average forward price for Western Canadian Select Crude Oil for the remaining term | $ / bbl | 42.93 |  |
WTI Option Volatility [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Average implied volatility contingent payment percentage | 35.60% |  |
U.S. to Canadian Dollar Foreign Exchange Average Rate Volatility Contingent Payment [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Average implied volatility contingent payment percentage | 6.80% |  |
Level 2 of Fair Value Hierarchy [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Debt, fair value | $ 8,608 | $ 7,610 |

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