Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Income Tax Contingency [Line Items]
Income tax benefit	$ (32,000,000)	$ 49,000,000	$ (33,000,000)	$ (42,000,000)
Change in valuation allowance tax benefit				106,000,000
Income taxes paid			69,000,000	57,000,000
Income tax refunds			0	1,000,000
REA Group [Member]
Income Tax Contingency [Line Items]
Income tax benefit	(32,000,000)		(33,000,000)
Income tax loss due to effective tax rate	251,000,000		252,000,000
Income tax adjustment due to non-cash write-down of assets and investments	$ 121,000,000		$ 121,000,000
Tax Benefits of Discontinued Operations [Member] | Digital Education [Member]
Income Tax Contingency [Line Items]
Income tax benefit discontinued operations				$ 144,000,000