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Related Parties - Summary of Directors and Executive Board Management Compensation (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Directors [member]      
Disclosure of transactions between related parties [line items]      
Short-term employee benefits $ 2 $ 2 $ 2
Total Compensation 2 2 2
Executive Committee [member]      
Disclosure of transactions between related parties [line items]      
Short-term employee benefits 11 15 12
Share-based payment 57 55 46
Total Compensation $ 68 $ 70 $ 58