Financial Instruments and Fair Value Measurements - Summary of Mandatorily Redeemable Noncontrolling Interest Liabilities Classified Level 3 (Detail) - Financial Instruments Subject To Mandatory Redemption Settlement Terms Share Value [Member] - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance—beginning of period	$ 12	$ 79
Additions	0	12
Payments	0	(81)
Measurement adjustments	(4)	0
Accretion	4	3
Foreign exchange movements	(1)	(1)
Balance—end of period	$ 11	$ 12