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Deferred Taxation - Reconciliation of changes in deferred tax liability asset (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Reconciliation of changes in deferred tax liability (asset) [abstract]      
Deferred tax liability/(asset) $ (118) $ (532)  
Adjustment on currency translation (43) (77)  
Credited to the income statement 178 289  
Charged/(credited) to statement of comprehensive income 115 77 $ (325)
Other movements 14 125  
Deferred tax liability/(asset) 146 (118) $ (532)
– deferred tax liabilities (3,239) (3,220)  
Deferred tax assets $ 3,385 $ 3,102