Discontinued Operations - Summary of Results of Operations from Discontinued Segment (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
(Loss) income from discontinued operations, net of tax	$ (24)	$ (19)	$ 22	$ (40)
Digital Education [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues	1	22	27	64
Loss before income tax benefit	(29)	(32)	(151)	(63)
Income tax benefit	5	13	173	23
(Loss) income from discontinued operations, net of tax	$ (24)	$ (19)	$ 22	$ (40)