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Net Recognized Gains (Losses) on Equity Investments (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]      
Net realized gains on investments sold $ 75 $ 29 $ 123
Net unrealized gains on investments still held 303 509 1,057
Total 260 461 1,232
Equity Securities      
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]      
Impairments of investments (20) (20) (11)
Total $ 358 $ 518 $ 1,169