Net Recognized Gains (Losses) on Equity Investments (Detail) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Sep. 30, 2022 |
Sep. 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 | $ 83 | $ 37 |
| Net unrealized gains (losses) on investments still held | (28) | 325 |
| Total | 13 | 371 |
| 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 | (7) | 0 |
| Total | $ 48 | $ 362 |