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Deferred taxation - Reconciliation of changes in deferred tax liability asset (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Deferred tax asset/(liability) $ (146) $ 118  
Adjustment on currency translation 61 (43)  
(Charged)/credited to the income statement (114) 178  
(Charged)/credited to statement of comprehensive income (243) 115 $ 77
Other movements 22 14  
Deferred tax asset/(liability) 128 (146) $ 118
Deferred tax assets 3,375 3,385  
Deferred tax liabilities $ (3,503) $ (3,239)