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Common Share Activities (Detail) - CAD ($) shares in Thousands, $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Class of Stock [Line Items] |  |  |
Common stock beginning balance, shares |  | 678,080 |
Common stock, ending balance, shares |  | 669,144 | 678,080
Common stock beginning balance, value | [1] | $ 1,252 |
Common stock, ending balance, value | [1] | $ 1,237 | $ 1,252
Common Stock |  |  |
Class of Stock [Line Items] |  |  |
Common stock beginning balance, shares |  | 678,080 | 734,077
Issued under employee share-based awards, shares |  | 0 | 7
Purchases at stated value, shares |  | (8,936) | (56,004)
Common stock, ending balance, shares |  | 669,144 | 678,080
Common stock beginning balance, value |  | $ 1,252 | $ 1,357
Issued under employee share-based awards, value |  | 0 | 0
Purchases at stated value, value |  | (15) | (105)
Common stock, ending balance, value |  | $ 1,237 | $ 1,252
[1] | Number of common shares authorized and outstanding were 1,100 million and 669 million, respectively (2021 - 1,100 million and 678 million, respectively).

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