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Income taxes - Summary of movement in deferred tax balances (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Unutilized tax losses $ 6,324 $ 4,933
Deferred Tax Liability Arising From Property Plant And Equipment [Member]    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance 1 6
Recognized in profit or loss 2 (5)
Ending balance 3 1
Deferred Tax Assets Arising From Deferred Revenue [Member]    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance 0 0
Recognized in profit or loss 5 0
Ending balance 5 0
Deferred Tax Assets Deferred Revenue [Member]    
Reconciliation of changes in deferred tax liability (asset) [abstract]    
Beginning balance $ 0  
Ending balance   $ 0