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Related Parties - Summary of Directors and Executive Board Management Compensation (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Directors [member]      
Disclosure of transactions between related parties [line items]      
Short-term employee benefits $ 2 $ 2 $ 2
Share-based payment    
Total Compensation 2 2 2
Executive Committee [member]      
Disclosure of transactions between related parties [line items]      
Short-term employee benefits 24 4 9
Termination benefits 0 2 1
Share-based payment 33 7 25
Total Compensation $ 57 $ 13 $ 35