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Net Recognized Gains (Losses) on Equity Investments (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2026
Mar. 31, 2025
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 $ 32 $ 9 $ 106 $ 66
Net unrealized gains on investments still held 1,621 135 1,371 572
Total 1,652 111 1,419 (286)
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 (31) (27) (87) (899)
Total $ 1,622 $ 117 $ 1,390 $ (261)