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Net Recognized Gains (Losses) on Debt Investments (Detail) - USD ($)
$ in Millions
 12 Months Ended
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]      
Realized gains from sales of available-for-sale securities $ 36 $ 162 $ 105
Realized losses from sales of available-for-sale securities (124) (138) (40)
Total 260 461 1,232
Debt Securities      
Schedule Of Gain Loss On Investments Including Marketable Securities And Investments Held At Cost Income Statement Reported Amounts Summary [Line Items]      
Impairments and allowance for credit losses (10) (81) (2)
Total $ (98) $ (57) $ 63