Net Recognized Gains (Losses) on Equity Investments (Detail) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
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 |