Income Taxes - Change in Unrecognized Tax Benefits, Excluding Interest and Penalties (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Balance, beginning of period	$ 62	$ 64	$ 86
Additions for prior year tax positions	0	2	107
Additions for current year tax positions	4	3	5
Reduction for prior year tax positions	0	(4)	(9)
Lapse of the statute of limitations	(6)	(3)	(8)
Settlement—cash	0	0	(21)
Settlement—tax attributes	0	(2)	(94)
Impact of currency translations	(2)	2	(2)
Balance, end of period	$ 58	$ 62	$ 64