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Financial Instruments - Narrative (Detail) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 CAD ($) $ / bbl | Sep. 30, 2020 | Dec. 31, 2020 CAD ($)
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Long-Term Debt | $ 12,986 |  | $ 7,441
Discounted credit adjusted risk free rate | 2.30% |  |
Estimated fair value of contingent payment | $ 392 |  | 63
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 | 77.66 |  |
WTI Option Implied Volatility |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Average volatility contingent payment percentage | 35.80% |  |
U.S. to Canadian Dollar Foreign Exchange Average Rate Volatility Contingent Payment [Member] |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Average volatility contingent payment percentage |  | 6.80% |
Level 2 of fair value hierarchy |  |  |
Disclosure of detailed information about financial instruments [Line Items] |  |  |
Debt, fair value | $ 14,427 |  | $ 8,608

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