Gains (Losses) on Fair Value Hedges and Related Hedged Items (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Foreign Exchange Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives	$ 38	$ 25	$ 441
Hedged items	130	78	(386)
Total amount of ineffectiveness	168	103	55
Equity Contracts
Derivative Instruments, Gain (Loss) [Line Items]
Derivatives	0	(324)	(74)
Hedged items	0	324	74
Total amount of ineffectiveness	0	0	0
Amount of equity contracts excluded from effectiveness assessment	$ 0	$ 80	$ (80)