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Changes in Equity and Earnings per Share - Summary of Changes in Issued Capital and Treasury Shares (Detail)
$ in Millions
 6 Months Ended
Jun. 30, 2026
USD ($)
shares
Jun. 30, 2026
EUR (€)
shares
Jun. 30, 2025
USD ($)
Disclosure of classes of share capital [line items]      
At the end of the previous year | shares 2,019,000,000 2,019,000,000  
Changes during the period | shares 0 0  
At the end of the current year | 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 € 1,238,608,344.12  
Changes during the period $ 128   $ (1,717)
Ordinary shares [member]      
Disclosure of classes of share capital [line items]      
At the end of the current year | shares 1,797,000,000 1,797,000,000  
Treasury shares [member]      
Disclosure of classes of share capital [line items]      
Restricted shares | shares 222,037,958 222,037,958  
At the end of the previous year | shares 68,500,000 68,500,000  
Changes during the period | shares (20,800,000) (20,800,000)  
At the end of the current year | shares 47,700,000 47,700,000  
Result on the use of treasury shares [member]      
Disclosure of classes of share capital [line items]      
At the end of the previous year $ (6,316)    
Changes during the period (1,439)    
At the end of the current year (7,755)    
Treasury shares [member]      
Disclosure of classes of share capital [line items]      
At the end of the previous year (5,083)    
Changes during the period 1,567   $ (1,138)
At the end of the current year $ (3,516)