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Net Recognized Gains (Losses) on Equity Investments (Detail) - USD ($)
$ in Millions
 3 Months Ended
Sep. 30, 2022
Sep. 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 $ 83 $ 37
Net unrealized gains (losses) on investments still held (28) 325
Total 13 371
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 (7) 0
Total $ 48 $ 362