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Contributed equity - Summary of Information about Shares Reserved for Employee Share Plans (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Employee Share Plans [Member]      
Disclosure of classes of share capital [line items]      
Beginning balance, shares 1,873,777 1,819,744 1,766,099
Beginning balance $ (38) $ (30) $ (23)
Purchases during the year, shares 2,332,121 2,232,589 2,683,469
Purchases during the year $ (57) $ (45) $ (47)
Vested/allocated during the year, shares (2,064,971)    
Vested/allocated during the year $ 46    
Vested during the year, shares   (2,178,556) (2,629,824)
Vested during the year   $ 37 $ 40
Ending balance, shares 2,140,927 1,873,777 1,819,744
Ending balance $ (49) $ (38) $ (30)
Dividend Reinvestment Plan [Member]      
Disclosure of classes of share capital [line items]      
Purchases during the year, shares   6,823,092  
Purchases during the year   $ (144)  
Vested during the year, shares   (6,823,092)  
Vested during the year   $ 144