Investments - Schedule of Summarized Financial Information (Detail) - Foxtel [Member] - USD ($) $ in Millions		3 Months Ended
		Sep. 30, 2017	Sep. 30, 2016
Schedule of Equity Method Investments [Line Items]
Revenues		$ 633	$ 618
Operating income	[1]	63	91
Net income		$ 24	$ 16

[1] Includes Depreciation and amortization of $59 million and $52 million for the three months ended September 30, 2017 and 2016, respectively. Operating income before depreciation and amortization was $122 million and $143 million for the three months ended September 30, 2017 and 2016, respectively.