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Income Taxes - Schedule of Components of Income Tax Expense (Benefit) (Parenthetical) (Detail) - Digital Education [Member] - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Income Taxes Disclosure [Line Items]
Income tax benefit	$ 0	$ 0	$ 174
Tax Benefits of Discontinued Operations [Member]
Income Taxes Disclosure [Line Items]
Income tax benefit discontinued operations			144
Income tax benefit			$ 30

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

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