Investments - Schedule of Losses of Equity Affiliates (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Equity losses of affiliates	$ (6)	$ (18)	$ (9)	$ (28)
Foxtel [Member]
Schedule of Equity Method Investments [Line Items]
Equity losses of affiliates	0	1	0	(4)
Other Equity Affiliates, Net [Member]
Schedule of Equity Method Investments [Line Items]
Equity losses of affiliates	$ (6)	$ (19)	$ (9)	$ (24)