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Net Recognized Gains (Losses) on Equity Investments (Detail) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2023
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 | $ 18 | $ 75
Net unrealized gains on investments still held | 536 | 146 | 303
Total | (349) | (118) | 260
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 | (951) | (229) | (20)
Total | $ (332) | $ (65) | $ 358

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