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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, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Income (loss) from discontinued operations, net of tax $ 0 $ 0 $ 0 $ 0 $ (5) $ (2) $ (24) $ 46 $ 0 $ 15 $ (445)
Digital Education [Member]                      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]                      
Revenues                 0 27 109
Loss before income tax benefit                 0 (159) (496)
Income tax benefit                 0 174 51
Income (loss) from discontinued operations, net of tax                 $ 0 $ 15 $ (445)