Components of Other Income (Expense), Net (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Other Income And Expenses [Abstract]
Dividends and interest income	$ 530	$ 311	$ 1,003	$ 604
Interest expense	(698)	(521)	(1,370)	(958)
Net recognized gains on investments	768	698	1,341	1,103
Net losses on derivatives	(84)	(46)	(134)	(140)
Net losses on foreign currency remeasurements	(60)	(153)	(69)	(193)
Other, net	34	(172)	(5)	(187)
Total	$ 490	$ 117	$ 766	$ 229