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Share Capital and Warrants - Issued and Outstanding - Common Shares (Detail) - Common shares - CAD ($) shares in Thousands, $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2021 | Dec. 31, 2020
Number of Common Shares |  |
Outstanding, Beginning of Year | 1,228,870 | 1,228,828
Issued Under the Arrangement, Net of Issuance Costs | 788,518 | 0
Issued Upon Exercise of Warrants (Note 22D) | 214 | 0
Issued Under Stock Option Plans (Note 24) | 34 | 42
Outstanding, End of Period | 2,017,636 | 1,228,870
Amount |  |
Outstanding, Beginning of Year | $ 11,040 | $ 11,040
Issued Under the Arrangement, Net of Issuance Costs | 6,110 | 0
Issued Upon Exercise of Warrants (Note 22D) | 2 | 0
Issued Under Stock Option Plans (Note 24) | 0 | 0
Outstanding, End of Period | $ 17,152 | $ 11,040

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