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Net Recognized Gains (Losses) on Equity Investments (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]        
Net realized gains (losses) on investments sold $ (31) $ (8) $ 14 $ 75
Net unrealized gains (losses) on investments still held 286 (7) 163 (35)
Total 69 (15) (38) (2)
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 (179) (9) (179) (16)
Total $ 76 $ (24) $ (2) $ 24