Investments - Schedule of Summarized Financial Information (Detail) - Foxtel [Member] - USD ($) $ in Millions		6 Months Ended
		Dec. 31, 2017	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Revenues		$ 1,231	$ 1,220
Operating income	[1]	120	184
Net income		$ 56	$ 40

[1] Includes Depreciation and amortization of $118 million and $103 million for the six months ended December 31, 2017 and 2016, respectively. Operating income before depreciation and amortization was $238 million and $287 million for the six months ended December 31, 2017 and 2016, respectively.