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Equity - Additional Information (Detail)
shares in Millions
 12 Months Ended
Dec. 31, 2020
$ / shares
shares
Dec. 31, 2019
shares
Disclosure of classes of share capital [line items]    
Common shares par value | $ / shares $ 10  
Shares allocated for exercise of employee stock options 500,000,000  
Issued capital 25,930.3 25,930.3
Legal capital reserve percentage 10.00%  
Percentage of paid in capital on reserve used to offset deficit or distribute as dividend in cash or stock 25.00%  
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 1,064.4  
Number of shares issued 5,321.8