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Share Capital and Warrants - Issued and Outstanding - Common Shares (Detail) - Common shares - CAD ($)
shares in Thousands, $ in Millions
 1 Months Ended 2 Months Ended 12 Months Ended
Feb. 07, 2022
Dec. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Number of Common Shares        
Outstanding, Beginning of Year 2,001,211   1,228,870 1,228,828
Issued Under the Arrangement, Net of Issuance Costs (Note 5A)     788,518 0
Issued Upon Exercise of Warrants     314 0
Issued Under Stock Option Plans     535 42
Purchase of Common Shares under NCIB (9,000) (17,000) (17,026) 0
Outstanding, End of Year   2,001,211 2,001,211 1,228,870
Amount        
Outstanding, Beginning of Year $ 17,016   $ 11,040 $ 11,040
Issued Under the Arrangement, Net of Issuance Costs (Note 5A)     6,111 0
Issued Upon Exercise of Warrants     3 0
Issued Under Stock Option Plans     7 0
Purchase of Common Shares under NCIB     (145) 0
Outstanding, End of Year   $ 17,016 $ 17,016 $ 11,040