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Retirement Benefit Obligations - Summary of Actuarial Value of Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of Net Defined Benefit Liability (Asset) [Line Items]      
Net pension deficit [1] $ (309) $ (556)  
Related deferred income tax asset 89 128  
Net pension liability (220) (428)  
Eurozone [member]      
Disclosure of Net Defined Benefit Liability (Asset) [Line Items]      
Net pension liability (87) (138)  
United States and Canada [member]      
Disclosure of Net Defined Benefit Liability (Asset) [Line Items]      
Net pension liability (164) (206)  
Switzerland [member]      
Disclosure of Net Defined Benefit Liability (Asset) [Line Items]      
Net pension liability 66 22  
Other [member]      
Disclosure of Net Defined Benefit Liability (Asset) [Line Items]      
Net pension liability (35) (106)  
Defined pension liabilities [member]      
Disclosure of Net Defined Benefit Liability (Asset) [Line Items]      
Actuarial value of liabilities (3,483) (3,877)  
Net pension deficit 3,483 3,877 $ 3,493
Defined pension liabilities [member] | Eurozone [member]      
Disclosure of Net Defined Benefit Liability (Asset) [Line Items]      
Actuarial value of liabilities (1,671) (1,769)  
Defined pension liabilities [member] | United States and Canada [member]      
Disclosure of Net Defined Benefit Liability (Asset) [Line Items]      
Actuarial value of liabilities (1,093) (1,293)  
Defined pension liabilities [member] | Switzerland [member]      
Disclosure of Net Defined Benefit Liability (Asset) [Line Items]      
Actuarial value of liabilities (394) (425)  
Defined pension liabilities [member] | Other [member]      
Disclosure of Net Defined Benefit Liability (Asset) [Line Items]      
Actuarial value of liabilities $ (325) $ (390)  
[1]  Reconciliation to Group Balance Sheet