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Common Share Activities (Detail) - CAD ($) shares in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Class of Stock [Line Items] |  |  |  |
Common stock beginning balance, shares |  | 782,565 |  |
Common stock, ending balance, shares |  | 743,902 | 782,565 |
Common stock beginning balance, value | [1] | $ 1,446 |  |
Common stock, ending balance, value | [1] | $ 1,375 | $ 1,446 |
Common Stock |  |  |  |
Class of Stock [Line Items] |  |  |  |
Common stock beginning balance, shares |  | 782,565 | 831,242 | 847,599
Issued under employee share-based awards, shares |  | 1 | 2 | 2
Purchases at stated value, shares |  | (38,664) | (48,679) | (16,359)
Common stock, ending balance, shares |  | 743,902 | 782,565 | 831,242
Common stock beginning balance, value |  | $ 1,446 | $ 1,536 | $ 1,566
Issued under employee share-based awards, value |  | 0 | 0 | 0
Purchases at stated value, value |  | (71) | (90) | (30)
Common stock, ending balance, value |  | $ 1,375 | $ 1,446 | $ 1,536
[1] | Number of common shares authorized and outstanding were 1,100 million and 744 million, respectively (2018 – 1,100 million and 783 million, respectively), (note 11).

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