Financial Instruments and Fair Value Measurements - Summary of Hedges Classified as Current or Non-Current in Consolidated Balance Sheets Based on Maturity Dates (Detail) - USD ($) $ in Millions	Jun. 30, 2018	Jun. 30, 2017
Foreign Currency Derivatives [Member] | Cash Flow Hedging [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, reported under other current assets	$ 3	$ 0
Cross Currency Interest Rate Derivatives [Member] | Cash Flow Hedging [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, reported under other non-current assets	76	0
Derivatives, reported under other non-current liabilities	(12)	0
Cross Currency Interest Rate Derivatives [Member] | Fair Value Hedging [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, reported under other non-current assets	29	0
Cross Currency Interest Rate Derivatives [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, reported under other non-current assets	10	0
Interest Rate Contract [Member] | Cash Flow Hedging [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, reported under other non-current liabilities	$ (20)	$ 0