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Contributed equity - Summary of Information about Shares Reserved for Employee Share Plans (Detail) - Employee Share Plans [Member] - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Disclosure of classes of share capital [line items]    
Beginning balance, shares 2,140,927 1,873,777
Beginning balance $ (49) $ (38)
Purchases during the period, shares 1,262,082 2,332,121
Purchases during the period $ (25) $ (57)
Vested/allocated during the period, shares (424,959) (2,064,971)
Vested/allocated during the period $ 9 $ 46
Ending balance, shares 2,978,050 2,140,927
Ending balance $ (65) $ (49)