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Finance Costs - Summary of Financial Income and Expenses (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure Of Detailed Finance (Income) Costs Explanatory [line items]      
Financial income on deposits and money market funds $ 2 $ 3 $ 2
Interest income on loans and other assets 2 3 3
Financial income 4 6 5
Interest expense on bonds and syndicated facility 102 78 61
Interest expense on lease liabilities 37 41 39
Capitalised interest (1) (5) (5)
Unwind of discount on deferred purchase consideration 1 1 1
Other charges 5 6 5
Financial expenses 144 121 101
Financial expenses before exceptional items 130 121 101
Financial expenses 144 $ 121 $ 101
Exceptional items [member]      
Disclosure Of Detailed Finance (Income) Costs Explanatory [line items]      
Financial expenses 14    
Financial expenses $ 14