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Changes in Equity and Earnings per Share - Summary of Changes in Issued Capital and Treasury Shares (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of classes of share capital [line items]      
At the end of the previous year 2,019,000,000    
Changes during the period 0    
At the end of the current year 2,019,000,000 2,019,000,000  
Ordinary shares 2,019,000,000 2,019,000,000  
At the end of the previous year $ 1,736    
Changes during the period 0    
At the end of the current year 1,736 $ 1,736  
Changes during the period $ 81 $ 385  
Ordinary shares [member]      
Disclosure of classes of share capital [line items]      
At the end of the current year 1,737,000,000    
Ordinary shares 1,737,000,000    
Treasury shares [member]      
Disclosure of classes of share capital [line items]      
At the end of the current year 38,217,386    
Ordinary shares 38,217,386    
Restricted shares 282,107,042 325,999,817  
At the end of the previous year 47,000,000.0    
Changes during the period (8,800,000)    
At the end of the current year 38,200,000 47,000,000.0  
Result on the use of treasury shares [member]      
Disclosure of classes of share capital [line items]      
At the end of the previous year $ (3,530)    
Changes during the period (836)    
At the end of the current year (4,366) $ (3,530)  
Treasury shares [member]      
Disclosure of classes of share capital [line items]      
At the end of the previous year (4,911)    
Changes during the period 917 1,359 $ 279
At the end of the current year $ (3,994) $ (4,911)