Additional Financial Information - Components of Other, Net (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended				1 Months Ended
	Mar. 31, 2015		Mar. 31, 2014		Mar. 31, 2015		Mar. 31, 2014		Aug. 31, 2014
Components of Other Income (Expense) [Line Items]
Gain on sale of marketable securities	$ 0	[1]	$ 0	[1]	$ 29	[1]	$ 0	[1]
REA Group Inc [Member]
Components of Other Income (Expense) [Line Items]
Cash consideration on sale of marketable securities									104
Gain on sale of marketable securities					$ 29

[1] In August 2014, REA Group completed the sale of a minority interest held in marketable securities for total cash consideration of $104 million. As a result of the sale, REA Group recognized a pre-tax gain of $29 million, which was reclassified out of accumulated other comprehensive income and included in Other, net in the Statement of Operations.