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Retirement Benefit Obligations - Summary of Scheme Assets (Detail) - Plan assets [member] - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of Net Defined Benefit Liability (Asset) [Line Items]      
Scheme assets $ 3,174 $ 3,321 $ 3,013
Eurozone [member]      
Disclosure of Net Defined Benefit Liability (Asset) [Line Items]      
Scheme assets 1,563 1,603  
United States and Canada [member]      
Disclosure of Net Defined Benefit Liability (Asset) [Line Items]      
Scheme assets 873 1,018  
Switzerland [member]      
Disclosure of Net Defined Benefit Liability (Asset) [Line Items]      
Scheme assets 460 444  
Other [member]      
Disclosure of Net Defined Benefit Liability (Asset) [Line Items]      
Scheme assets $ 278 $ 256