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, 2018	Jun. 30, 2017
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance-beginning of year	$ 79	$ 82
Additions	12	0
Payments	(81)	0
Measurement adjustments	0	(8)
Accretion	3	3
Foreign exchange movements	(1)	2
Balance-end of year	$ 12	$ 79