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Dividends - Summary of Dividends Paid (Detail) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Disclosure of Dividends [abstract]      
Prior year final dividend, Per share $ 0.63 $ 0.43 $ 0.14
Interim dividend, Per share 0.55 0.55 0.40
Special dividend, Per share 1.02    
Dividends paid during the period, Per share $ 2.20 $ 0.98 $ 0.54
Prior year final dividend, Total $ 3,356 $ 2,291 $ 746
Interim dividend, Total 2,788 2,930 2,125
Special dividend, Total 5,158    
Dividends paid during the period, Total $ 11,302 $ 5,221 $ 2,871