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Dividends - Summary of Dividends Paid (Detail) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Disclosure of Dividends [abstract]      
Prior year final dividend, Per share $ 1.75 $ 2 $ 0.55
Interim dividend, Per share 0.90 1.50 1.01
Dividends paid during the period, Per share $ 2.65 $ 3.50 $ 1.56
Prior year final dividend, Total $ 8,858 $ 10,119 $ 2,779
Interim dividend, Total 4,562 7,601 5,115
Dividends paid during the period, Total $ 13,420 $ 17,720 $ 7,894