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Retirement Benefit Obligations - Additional Information (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Disclosure of defined benefit plans [Line Items]      
Net liability of defined benefit pension schemes [1] $ (309) $ (556)  
Employer contributions payable including estimated minimum funding payments 40    
Surplus (deficit) in plan   111  
Defined contribution expense 309 289 $ 290
Total defined benefit expense/(credit) 72 70 51
Aggregate continuing and discontinued operations [member]      
Disclosure of defined benefit plans [Line Items]      
Defined contribution expense     299
Total defined benefit expense/(credit)     70
United Kingdom [member]      
Disclosure of defined benefit plans [Line Items]      
Contractual payments to defined benefit scheme 17 20 $ 21
Defined contribution pension liabilities [member]      
Disclosure of defined benefit plans [Line Items]      
Trade and other payables 92 105  
Funded defined benefit obligation [member]      
Disclosure of defined benefit plans [Line Items]      
Net liability of defined benefit pension schemes 54 154  
Unfunded defined benefit obligation [member]      
Disclosure of defined benefit plans [Line Items]      
Net liability of defined benefit pension schemes $ 363 $ 402  
[1]  Reconciliation to Group Balance Sheet