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Net Recognized Gains (Losses) on Equity Investments (Detail) - USD ($) $ in Millions | 12 Months Ended
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Jun. 30, 2023 | Jun. 30, 2022 | Jun. 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 | $ 75 | $ 29 | $ 123
Net unrealized gains on investments still held | 303 | 509 | 1,057
Total | 260 | 461 | 1,232
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 | (20) | (20) | (11)
Total | $ 358 | $ 518 | $ 1,169

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