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Share Capital and Warrants - Additional Information (Detail) - CAD ($)
$ / shares in Units, shares in Thousands, $ in Millions
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Jul. 27, 2022
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Dec. 31, 2020
Disclosure of classes of share capital [Line Items]              
Maximum percentage of preferred stock upon issuance or outstanding of common stock       20.00%      
Payments to acquire or redeem entity's shares   $ 1,018 $ 0 $ 1,484 $ 0    
Common shares              
Disclosure of classes of share capital [Line Items]              
Purchase of Common Shares Under NCIB (in shares)       67,779   17,026  
Share repurchase program (in CAD per share)       $ 21.89      
Payments to acquire or redeem entity's shares       $ 1,500      
Share repurchase program, reduction to contributed surplus       $ 907      
Shares outstanding (in shares)   1,949,609   1,949,609   2,001,211 1,228,870
Issued capital   $ 16,653   $ 16,653   $ 17,016 $ 11,040
Common shares | Potential ordinary share transactions              
Disclosure of classes of share capital [Line Items]              
Purchase of Common Shares Under NCIB (in shares) 19,000            
Payments to acquire or redeem entity's shares $ 425            
Stock Option Plan              
Disclosure of classes of share capital [Line Items]              
Shares available for future issuance (in shares)   41,000   41,000   30,000  
Preference shares              
Disclosure of classes of share capital [Line Items]              
Shares outstanding (in shares)   36,000   36,000   36,000  
Issued capital   $ 519   $ 519   $ 519