Net Recognized Gains (Losses) on Equity Investments (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 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 (losses) on investments sold	$ (22)	$ 43	$ 46	$ 76
Net unrealized gains (losses) on investments still held	(34)	299	559	725
Total	(76)	353	595	837
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	(5)	0	(5)	(11)
Total	$ (61)	$ 342	$ 600	$ 790