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Stated Capital - Schedule of Stated Capital (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of classes of share capital [line items]    
Balance at beginning of the year $ 3,871.5  
Balance at end of the year 3,871.5 $ 3,871.5
Ordinary Shares    
Disclosure of classes of share capital [line items]    
Balance at beginning of the year 3,871.5 3,871.5
Balance at end of the year $ 3,871.5 $ 3,871.5
In issue at 1 January (in shares) 891,378,571 887,717,348
Exercise of employee share options (in shares) 2,162,242 3,661,223
In issue at 31 December (in shares) 893,540,813 891,378,571
Authorised (in shares) 2,000,000,000 2,000,000,000