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Provisions - Summary Of Provisions (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of other provisions [line items]    
Site restoration provision Beginning balance $ 6  
Legal provision Beginning balance 32  
Legal provision Ending balance 32 $ 32
Site restoration provision Ending balance 21 6
Provisions 53 38
Non-current 18 3
Current 35 35
Site restoration    
Disclosure of other provisions [line items]    
Site restoration provision Beginning balance 6 6
Provisions made during the year 18 1
Provisions reversed during the year (3) (1)
Site restoration provision Ending balance 21 6
Legal    
Disclosure of other provisions [line items]    
Legal provision Beginning balance 32 [1]
Provisions made during the year 1 31
Effect of movements in exchange rates (1) 1
Legal provision Ending balance $ 32 $ 32
[1] Amounts less than $1 million