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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, 2023
Dec. 31, 2022
Number of Common Shares    
Outstanding, Beginning of Year (in shares) 1,909,190 2,001,211
Issued Upon Exercise of Warrants (in shares) 2,314 9,399
Issued Under Stock Option Plans (in shares) 3,443 11,069
Purchases of common shares under NCIB (in shares) (29,388) (112,489)
Outstanding, End of Period (in shares) 1,885,559 1,909,190
Amount    
Outstanding, Beginning of Year $ 16,320 $ 17,016
Issued Upon Exercise of Warrants 23 93
Issued Under Stock Option Plans 54 170
Purchase of Common Shares Under NCIBs (251) (959)
Outstanding, End of Period $ 16,146 $ 16,320