Net Recognized Gains (Losses) on Debt Investments (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020
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	$ 162	$ 105	$ 50
Realized losses from sales of available-for-sale securities	(138)	(40)	(37)
Total	461	1,232	32
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	(81)	(2)	(17)
Total	$ (57)	$ 63	$ (4)