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Discontinued Operations - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Sep. 30, 2015	Mar. 31, 2017	Mar. 31, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pre-tax non-cash impairment charge				$ 321	$ 0
Severance and Lease Termination Costs [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss before income tax benefit					17
Digital Education [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss before income tax benefit	$ 0	$ 3		$ 0	$ 154
Assets of discontinued operations [Member] \| Digital Education [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pre-tax non-cash impairment charge			$ 76
Income tax benefit discontinued operations			$ 144

Amount before tax of income (loss) from a discontinued operation. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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