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Share Capital and Warrants - Issued and Outstanding - Common Shares (Detail) - Common shares - CAD ($)
shares in Thousands, $ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Number of Common Shares    
Outstanding, Beginning of Year (in shares) 2,001,211 1,228,870
Issued Under the Arrangement, net of Issuance Costs (in shares) 0 788,518
Issued Upon Exercise of Warrants (in shares) 6,571 314
Issued Under Stock Option Plans (in shares) 9,606 535
Purchases of Common Shares Under NCIB (in shares) (67,779) (17,026)
Outstanding, End of Period (in shares) 1,949,609 2,001,211
Amount    
Outstanding, Beginning of Year $ 17,016 $ 11,040
Issued Under the Arrangement, Net of Issuance Costs 0 6,111
Issued Upon Exercise of Warrants 65 3
Issued Under Stock Option Plans 149 7
Purchase of Common Shares Under NCIB (577) (145)
Outstanding, End of Period $ 16,653 $ 17,016