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Dividends - Summary of Dividends Paid (Detail) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Disclosure of Dividends [abstract]      
Prior year final dividend, Per share $ 0.78 $ 0.63 $ 0.43
Interim dividend, Per share 0.65 0.55 0.55
Special dividend, Per share   1.02  
Dividends paid during the period, Per share $ 1.43 $ 2.20 $ 0.98
Prior year final dividend, Total $ 3,946 $ 3,356 $ 2,291
Interim dividend, Total 3,288 2,788 2,930
Special dividend, Total   5,158  
Dividends paid during the period, Total $ 7,234 $ 11,302 $ 5,221