Components of Other Income (Expense), Net (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Other Income And Expenses [Abstract]
Interest and dividends income	$ 704	$ 530	$ 1,385	$ 1,003
Interest expense	(672)	(698)	(1,346)	(1,370)
Net recognized gains on investments	94	768	337	1,341
Net gains (losses) on derivatives	41	(84)	38	(134)
Net losses on foreign currency remeasurements	(74)	(60)	(69)	(69)
Other, net	34	34	48	(5)
Total	$ 127	$ 490	$ 393	$ 766