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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, 2025
Dec. 31, 2024
Dec. 31, 2023
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  
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 $ (2,106) $ (791) $ (237)
Ordinary shares [member]      
Disclosure of classes of share capital [line items]      
At the end of the current year 1,797,000,000    
Treasury shares [member]      
Disclosure of classes of share capital [line items]      
Restricted shares 222,041,979    
At the end of the previous year 43,800,000    
Changes during the period 24,700,000    
At the end of the current year 68,500,000 43,800,000  
Result on the use of treasury shares [member]      
Disclosure of classes of share capital [line items]      
At the end of the previous year $ (5,406)    
Changes during the period (910)    
At the end of the current year (6,316) $ (5,406)  
Treasury shares [member]      
Disclosure of classes of share capital [line items]      
At the end of the previous year (3,886)    
Changes during the period (1,197) (421) $ 240
At the end of the current year $ (5,083) $ (3,886)