Financial Instruments and Fair Value Measurements - Summary of Assets and Liabilities Measured At Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions		Jun. 30, 2018	Jun. 30, 2017
Assets:
Available-for-sale securities	[1],[2]	$ 93	$ 97
Total assets		211	97
Liabilities:
Mandatorily redeemable noncontrolling interests	[3]	12	79
Total liabilities		44	79
Foreign Currency Derivatives [Member] | Cash Flow Hedging [Member]
Assets:
Derivative assets	[4]	3	0
Cross Currency Interest Rate Derivatives [Member] | Fair Value Hedging [Member]
Assets:
Derivative assets	[4]	29	0
Cross Currency Interest Rate Derivatives [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member]
Assets:
Derivative assets	[4]	10	0
Cross Currency Interest Rate Derivatives [Member] | Cash Flow Hedging [Member]
Assets:
Derivative assets	[4]	76	0
Liabilities:
Cross currency interest rate derivatives-cash flow hedges(a)	[4]	12	0
Foreign Exchange Contract [Member] | Cash Flow Hedging [Member]
Liabilities:
Cross currency interest rate derivatives-cash flow hedges(a)	[4]	20	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Assets:
Available-for-sale securities	[2]	93	97
Total assets		93	97
Liabilities:
Mandatorily redeemable noncontrolling interests	[3]	0	0
Total liabilities		0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Foreign Currency Derivatives [Member] | Cash Flow Hedging [Member]
Assets:
Derivative assets	[4]	0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Cross Currency Interest Rate Derivatives [Member] | Fair Value Hedging [Member]
Assets:
Derivative assets	[4]	0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Cross Currency Interest Rate Derivatives [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member]
Assets:
Derivative assets	[4]	0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Cross Currency Interest Rate Derivatives [Member] | Cash Flow Hedging [Member]
Assets:
Derivative assets	[4]	0	0
Liabilities:
Cross currency interest rate derivatives-cash flow hedges(a)	[4]	0	0
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Foreign Exchange Contract [Member] | Cash Flow Hedging [Member]
Liabilities:
Cross currency interest rate derivatives-cash flow hedges(a)	[4]	0	0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Assets:
Available-for-sale securities	[2]		0
Total assets		118	0
Liabilities:
Mandatorily redeemable noncontrolling interests	[3]	0	0
Total liabilities		32	0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Foreign Currency Derivatives [Member] | Cash Flow Hedging [Member]
Assets:
Derivative assets	[4]	3	0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Cross Currency Interest Rate Derivatives [Member] | Fair Value Hedging [Member]
Assets:
Derivative assets	[4]	29	0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Cross Currency Interest Rate Derivatives [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member]
Assets:
Derivative assets	[4]	10	0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Cross Currency Interest Rate Derivatives [Member] | Cash Flow Hedging [Member]
Assets:
Derivative assets	[4]	76	0
Liabilities:
Cross currency interest rate derivatives-cash flow hedges(a)	[4]	12	0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Foreign Exchange Contract [Member] | Cash Flow Hedging [Member]
Liabilities:
Cross currency interest rate derivatives-cash flow hedges(a)	[4]	20	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]
Assets:
Available-for-sale securities	[2]	0	0
Total assets		0	0
Liabilities:
Mandatorily redeemable noncontrolling interests	[3]	12	79
Total liabilities		12	79
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Foreign Currency Derivatives [Member] | Cash Flow Hedging [Member]
Assets:
Derivative assets	[4]	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Cross Currency Interest Rate Derivatives [Member] | Fair Value Hedging [Member]
Assets:
Derivative assets	[4]	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Cross Currency Interest Rate Derivatives [Member] | Not Designated as Hedging Instrument, Economic Hedge [Member]
Assets:
Derivative assets	[4]	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Cross Currency Interest Rate Derivatives [Member] | Cash Flow Hedging [Member]
Assets:
Derivative assets	[4]	0	0
Liabilities:
Cross currency interest rate derivatives-cash flow hedges(a)	[4]	0	0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Foreign Exchange Contract [Member] | Cash Flow Hedging [Member]
Liabilities:
Cross currency interest rate derivatives-cash flow hedges(a)	[4]	$ 0	$ 0

[1] Available-for-sale securities are primarily comprised of the Company's investment in HT&E Limited, which operates a portfolio of Australian radio and outdoor media assets.

[2] See Note 6-Investments.

[3] Primarily related to REA Group's mandatorily redeemable noncontrolling interest associated with the acquisition of iProperty. The fair value is determined based on the formula specified in the acquisition agreement and REA Group management's expectations of the business' performance. The mandatorily redeemable noncontrolling interest was redeemed in April 2018, and the amount paid was based on the actual performance of the business against the targets stipulated in the acquisition agreement.

[4] As a result of the Transaction, the Company now consolidates certain derivative instruments that were outstanding as of the Transaction date. As part of purchase accounting, certain derivatives which were previously designated in hedging relationships were dedesignated and redesignated as of such date and recorded at fair value. See Note 3-Acquisitions, Disposals and Other Transactions.