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Decommissioning Liabilities - Summary of Changes to the Credit-Adjusted Risk-Free Rate or the Inflation Rate Impact on the Decommissioning Liabilities (Detail) - CAD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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One percent increase |  |
Disclosure of other provisions [line items] |  |
Credit-Adjusted Risk-Free Rate | $ (623) | $ (228)
Inflation Rate | 873 | 321
One percent decrease |  |
Disclosure of other provisions [line items] |  |
Credit-Adjusted Risk-Free Rate | 875 | 313
Inflation Rate | $ (625) | $ (235)

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- Definition Theoretical impact to decommissioning liability from increase/decrease in credit -adjusted risk free rate + References No definition available. + Details
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- Definition Theoretical impact to decommissioning liability from increase/decrease in inflation rate + References No definition available. + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
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- Details
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- Details
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