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Employee Purchased Shares (Detail) - $ / shares
shares in Millions
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Shares purchased 9 11 13
Average price per share $ 142.22 $ 104.85 $ 76.40