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Discontinued Operations - Summary of Results of Operations from Discontinued Segment (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Income (loss) from discontinued operations, net of tax $ (383) $ (22) $ (19) $ (21) $ (5) $ (2) $ (24) $ 46 $ 15 $ (445) $ (142)
Digital Education [Member]                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Revenues                 27 109 88
Loss before income tax benefit                 (159) (496) (219)
Income tax benefit                 174 51 77
Income (loss) from discontinued operations, net of tax                 $ 15 $ (445) $ (142)