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Investments - Schedule of Available-for-Sale Securities (Detail) - USD ($)
$ in Millions
Sep. 30, 2017
Jun. 30, 2017
Investments Schedule [Abstract]    
Cost basis of available-for-sale securities $ 100 $ 99
Accumulated gross unrealized gain 0 0
Accumulated gross unrealized loss [1] (19) (2)
Fair value of available-for-sale securities [2] 81 97
Net deferred tax asset $ 5 $ 1
[1] The fair values of the Company's available-for-sale securities in an unrealized loss position have been less than their cost basis for a period of less than twelve months.
[2] Available-for-sale securities primarily include the Company's investment in HT&E Limited (formerly APN News and Media Limited), which operates a portfolio of Australian radio and outdoor media assets.