Investments - Schedule of Losses of Equity Affiliates (Parenthetical) (Detail) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Mar. 31, 2018 USD ($)
Schedule of Equity Method Investments [Line Items]
Impairments of investment		$ 13
Valuation, Income Approach [Member] | Measurement Input, Discount Rate [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment measurement input	0.1025		0.1025
Valuation, Income Approach [Member] | Measurement Input, Long-term Revenue Growth Rate [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment measurement input	0.020		0.020
Foxtel [Member]
Schedule of Equity Method Investments [Line Items]
Impairments of investment	$ 957		$ 957
Other Equity Affiliates, Net [Member]
Schedule of Equity Method Investments [Line Items]
Impairments of investment			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	$ 17		$ 49