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Discontinued Operations - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 30, 2015
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Pre-tax non-cash impairment charge   $ 280 $ 785 $ 0
Digital Education [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Loss before income tax benefit   $ 0 $ 0 $ 159
Digital Education [Member] | 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      
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