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Equity - Additional Information (Detail)
shares in Millions
 12 Months Ended
Dec. 31, 2021
$ / shares
shares
Dec. 31, 2020
$ / shares
shares
Apr. 15, 2022
shares
Disclosure of classes of share capital [line items]      
Common shares par value | $ / shares $ 10 $ 10  
Shares allocated for exercise of employee stock options 500,000,000.0 500,000,000.0  
Issued capital 25,930.3 25,930.3  
Legal capital reserve percentage 10.00% 10.00%  
Percentage of paid in capital on reserve used to offset deficit or distribute as dividend in cash or stock 25.00% 25.00%  
Non Adjusting Events After Reporting Period [Member]      
Disclosure of classes of share capital [line items]      
Share buy back plan aggregate shares repurchased     1.4
Top of range [member]      
Disclosure of classes of share capital [line items]      
Total distribution 50.00%    
American Depositary Shares (one represents five common shares) [member]      
Disclosure of classes of share capital [line items]      
Issued capital 1,064.2    
Number of shares issued 5,321.2