Components of Other Income (Expense), Net (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Other Income And Expenses [Abstract]
Interest and dividends income	$ 668	$ 575	$ 2,053	$ 1,578
Interest expense	(671)	(691)	(2,017)	(2,061)
Net recognized gains on investments	44	510	381	1,851
Net gains (losses) on derivatives	51	(72)	89	(206)
Net gains (losses) on foreign currency remeasurements	37	20	(32)	(49)
Other, net	16	7	64	2
Total	$ 145	$ 349	$ 538	$ 1,115