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Stock-Based Compensation Plans - Summary of Stock-Based Compensation (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Stock-Based Compensation Expense (Recovery) | $ 159 | $ 49 | $ 67
Stock-Based Compensation Costs Capitalized | 8 | 16 | 20
Total Stock-Based Compensation | 167 | 65 | 87
Net settlement rights |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Stock-Based Compensation Expense (Recovery) | 14 | 11 | 9
Replacement Stock Options |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Stock-Based Compensation Expense (Recovery) | 26 | 0 | 0
Performance Share Units |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Stock-Based Compensation Expense (Recovery) | 56 | 19 | 15
Restricted Share Units |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Stock-Based Compensation Expense (Recovery) | 48 | 23 | 34
Deferred Share Units |  |  |
Disclosure of terms and conditions of share-based payment arrangement [Line Items] |  |  |
Stock-Based Compensation Expense (Recovery) | $ 15 | $ (4) | $ 9

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