Investments - Schedule of Available-for-Sale Investments (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015		Jun. 30, 2014
Investments Schedule [Abstract]
Cost basis of available-for-sale investments	$ 77		$ 113
Accumulated gross unrealized gain	58		38
Accumulated gross unrealized loss	0		0
Fair value of available-for-sale investments	135	[1]	151	[1]
Net deferred tax liability	$ 22		$ 14

[1] In March 2015, the Company agreed to increase its 4.8% interest in APN News and Media Limited ("APN") to 14.99% for a purchase price of approximately $70 million. APN operates a portfolio of Australian and New Zealand radio and outdoor media assets and small regional print interests. The acquisition is subject to regulatory approval and is expected to be completed in the fourth quarter of fiscal 2015. If regulatory approval is not obtained, the APN shares will be sold to alternative purchasers with the Company bearing the economic loss if the sales price is lower than the Company's agreed purchase price and benefiting from the gain if the sales price is higher.