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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)

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