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Discontinued Operations - Additional Information (Detail) - USD ($) $ in Millions		3 Months Ended			6 Months Ended
	Sep. 30, 2015	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014	Dec. 31, 2015	Dec. 31, 2014
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		$ (29)		$ (32)	$ (151)	$ (63)
Assets of discontinued operations [Member] \| Digital Education [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued operations, 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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