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Investments - Schedule of Available-for-Sale Securities (Detail) - USD ($)
$ in Millions
Mar. 31, 2018
Jun. 30, 2017
Investments Schedule [Abstract]    
Cost basis of available-for-sale securities $ 77 $ 99
Accumulated gross unrealized gain 1 0
Accumulated gross unrealized loss 0 (2)
Fair value of available-for-sale securities [1],[2] 78 97
Net deferred tax asset $ 0 $ 1
[1] Available-for-sale securities are primarily comprised of 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.
[2] See Note 4 - Investments.