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Leases - Summary of Right-of-use Assets (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance $ 39 $ 49
Depreciation (27) (30)
Additions 106 24
Derecognition [1] (5)
Effects of movement in exchange rates [1] 1
Ending balance 118 39
Amounts recognized in profit or loss    
Interest on lease liabilities 5 3
Income from sub-leasing right-of-use assets presented in ‘Revenue' (1) (2)
Expenses relating to short-term leases 1 1
Expenses relating to leases of low-value assets, excluding short-term leases of low-value assets [2]
Expenses relating to variable lease payments not included in the measurement of lease liabilities 1 1
Amounts recognized in statement of cash flows    
Cash outflow for leases 24 30
Property [Member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance 39 48
Depreciation (27) (29)
Additions 100 24
Derecognition [1] (5)
Effects of movement in exchange rates [1] 1
Ending balance 112 39
Motor vehicles [Member]    
Disclosure of quantitative information about right-of-use assets [line items]    
Beginning balance [1] 1
Depreciation [1] (1)
Additions 6 [1]
Derecognition [1]
Effects of movement in exchange rates [1]
Ending balance $ 6 [1]
[1] Amounts less than $1 million
[2] Amount less than $1 million