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	9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance—beginning of period	$ 12	$ 79
Additions	0	12
Accretion	1	2
Foreign exchange movements	(1)	(1)
Balance—end of period	$ 12	$ 92