Financial Instruments and Fair Value Measurements - Summary of Hedges Classified as Current or Non-Current in Balance Sheets Based on Maturity Dates (Detail) - USD ($) $ in Millions	Jun. 30, 2020	Jun. 30, 2019
Foreign Currency Derivatives | Cash Flow Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, reported under other current assets	$ 0	$ 1
Derivatives, reported under other current liabilities	(3)	0
Cross Currency Interest Rate Derivatives | Cash Flow Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, reported under other current assets	0	33
Derivatives, reported under other non-current assets	98	83
Derivatives, reported under other non-current liabilities	(16)	(18)
Cross Currency Interest Rate Derivatives | Fair Value Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, reported under other current assets	0	8
Derivatives, reported under other non-current assets	24	21
Cross Currency Interest Rate Derivatives | Not Designated as Hedging Instrument, Economic Hedge
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, reported under other current assets	0	12
Interest Rate Contract | Cash Flow Hedging
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivatives, reported under other current liabilities	0	(2)
Derivatives, reported under other non-current liabilities	$ (18)	$ (18)