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Shares of Common Stock Outstanding (Detail) - shares
shares in Millions
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Equity [Abstract]      
Balance, beginning of year 7,643 7,677 7,708
Issued 54 116 68
Repurchased (126) (150) (99)
Balance, end of year 7,571 7,643 7,677