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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