Investments - Schedule of (Losses) Earnings of Equity Affiliates (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Schedule of Equity Method Investments [Line Items]
Impairment of investment			$ 21	$ 21	$ 5
Foxtel [Member]
Schedule of Equity Method Investments [Line Items]
Impairment of investment		$ 227	227
Foxtel [Member] | Equity (Losses) Earnings of Affiliates [Member]
Schedule of Equity Method Investments [Line Items]
Amortization of excess basis allocated to finite-lived intangible assets			$ 68	$ 52	$ 57
Other Equity Affiliates, Net [Member]
Schedule of Equity Method Investments [Line Items]
Impairment of investment	$ 9