Income Taxes - Change in Unrecognized Tax Benefits, Excluding Interest and Penalties (Detail) - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance, beginning of period	$ 58	$ 62	$ 64
Additions for prior year tax positions	4	0	2
Additions for current year tax positions	8	4	3
Reduction for prior year tax positions	(1)	0	(4)
Lapse of the statute of limitations	(3)	(6)	(3)
Settlement—cash	0	0	0
Settlement—tax attributes	(2)	0	(2)
Impact of currency translations	(1)	(2)	2
Balance, end of period	$ 63	$ 58	$ 62