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Shares of Common Stock Outstanding (Detail) - shares
shares in Millions
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Equity [Abstract]      
Balance, beginning of year 7,571 7,643 7,677
Issued 49 54 116
Repurchased (101) (126) (150)
Balance, end of year 7,519 7,571 7,643