Investments - Schedule of Losses of Equity Affiliates (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2019	Mar. 31, 2018
Schedule of Equity Method Investments [Line Items]
Equity losses of affiliates	$ (4)	$ (974)	$ (13)	$ (1,002)
Foxtel [Member]
Schedule of Equity Method Investments [Line Items]
Equity losses of affiliates	0	(970)	0	(974)
Other Equity Affiliates, Net [Member]
Schedule of Equity Method Investments [Line Items]
Equity losses of affiliates	$ (4)	$ (4)	$ (13)	$ (28)