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Risk management - Components of Risk Management on Consolidated Statements of Income (Loss) (Detail) - CAD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Disclosure of nature and extent of risks arising from financial instruments [line items] |  |  |
Realized risk management gain/loss on settlement of commodity contracts | $ 1 | $ 22 | $ (8)
Total realized gain (loss) | 1 | 22 | (8)
Unrealized risk management gain/loss on commodity contracts | 3 |  | (5)
Total unrealized gain (loss) | 3 |  | (5)
Risk management gain (loss) | $ 4 | $ 22 | $ (13)

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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- Definition Realized risk management gain loss. + References No definition available. + Details
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- Definition Realized risk management gain/loss on settlement of commodity contracts. + References No definition available. + Details
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- Definition Realized risk management gain (loss). + References No definition available. + Details
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- Definition Unrealized risk management gain loss. + References No definition available. + Details
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- Definition Unrealized risk management gain/loss on commodity contracts. + References No definition available. + Details
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