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Net Recognized Gains (Losses) on Equity Investments (Detail) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
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 $ 83 $ 276 $ 3,406
Net unrealized gains on investments still held 69 479 0
Total 32 648 2,399
Equity Securities      
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]      
Other-than-temporary impairments of investments (116) (10) (41)
Total $ 36 $ 745 $ 3,365