Investments - Schedule of Summarized Financial Information (Detail) - Foxtel [Member] - USD ($) $ in Millions		9 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Schedule of Equity Method Investments [Line Items]
Revenues		$ 1,818	$ 1,811
Operating income	[1]	155	263
Net income		$ 64	$ 40

[1] Includes Depreciation and amortization of $187 million and $155 million for the nine months ended March 31, 2018 and 2017, respectively. Operating income before depreciation and amortization was $342 million and $418 million for the nine months ended March 31, 2018 and 2017, respectively.