Fair Value Measurements - Summary of Assets and Liabilities Measured At Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions		Mar. 31, 2018	Jun. 30, 2017
Assets:
Available-for-sale securities	[1],[2]	$ 78	$ 97
Total assets		78	97
Liabilities:
Mandatorily redeemable noncontrolling interest	[3]	92	79
Total liabilities		92	79
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]
Assets:
Available-for-sale securities	[2]	78	97
Total assets		78	97
Liabilities:
Mandatorily redeemable noncontrolling interest	[3]	0	0
Total liabilities		0	0
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]
Assets:
Available-for-sale securities	[2]	0	0
Total assets		0	0
Liabilities:
Mandatorily redeemable noncontrolling interest	[3]	0	0
Total liabilities		0	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 interest	[3]	92	79
Total liabilities		$ 92	$ 79

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

[2] See Note 4 - 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 formulas 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.