Discontinued Operations - Summary of Assets and Liabilities Held for Sale Related to Discontinued Operations (Detail) - USD ($) $ in Millions	Jun. 30, 2016	Jun. 30, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net (liabilities) assets held for sale	$ 0	$ 92
Digital Education [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current assets	1	54
Non-current assets	0	100
Total assets	1	154
Current Liabilities	7	46
Non-current liabilities	0	16
Total liabilities	7	62
Net (liabilities) assets held for sale	$ (6)	$ 92