Investments - Schedule of Losses of Equity Affiliates (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
	Dec. 31, 2017	Dec. 31, 2017
Other Equity Affiliates, Net [Member]
Schedule of Equity Method Investments [Line Items]
Impairments of investment	$ 13	$ 13
Equity Losses of Affiliates [Member] | Foxtel [Member]
Schedule of Equity Method Investments [Line Items]
Amortization of excess basis allocated to finite-lived intangible assets	$ 15	$ 32