Discontinued Operations - Summary of Liabilities Held for Sale Related to Discontinued Operations (Detail) - Digital Education [Member] - USD ($) $ in Millions	Jun. 30, 2017	Jun. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Current assets	$ 0	$ 1
Non-current assets	0	0
Total assets	0	1
Current liabilities	0	7
Non-current liabilities	0	0
Total liabilities	0	7
Net liabilities held for sale	$ 0	$ (6)