Discontinued Operations - Summary of Results of Operations from Discontinued Segment (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2016	Mar. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) income from discontinued operations, net of tax	$ (2)	$ (22)	$ 20	$ (62)
Digital Education [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues	0	21	27	85
Loss before income tax benefit	(3)	(29)	(154)	(92)
Income tax benefit	1	7	174	30
(Loss) income from discontinued operations, net of tax	$ (2)	$ (22)	$ 20	$ (62)