Subsequent Events - Additional Information (Detail) $ in Millions, $ in Millions		1 Months Ended		3 Months Ended
		May 31, 2018 USD ($)	May 31, 2018 AUD ($)	Mar. 31, 2018 USD ($)	May 31, 2018 AUD ($)	Apr. 30, 2018	Jun. 30, 2017 USD ($)
Subsequent Event [Line Items]
Channel distribution agreement intangible asset carrying value				$ 2,226			$ 2,281
Foxtel [Member]
Subsequent Event [Line Items]
Equity method investment, ownership percentage	[1]			50.00%
FOX SPORTS Australia [Member]
Subsequent Event [Line Items]
Channel distribution agreement intangible asset carrying value				$ 322
Foxtel and Fox Sports Australia [Member] | Foxtel [Member]
Subsequent Event [Line Items]
Long term debt				$ 1,700
Equity method investment, ownership percentage				50.00%
Foxtel and Fox Sports Australia [Member] | FOX SPORTS Australia [Member]
Subsequent Event [Line Items]
Company ownership percentage				100.00%
Subsequent Event [Member] | REA Group [Member]
Subsequent Event [Line Items]
Long term debt		$ 55			$ 70
Payment to acquire business		$ 100	$ 130
Subsequent Event [Member] | Foxtel and Fox Sports Australia [Member]
Subsequent Event [Line Items]
Ownership interest						65.00%
Subsequent Event [Member] | Foxtel and Fox Sports Australia [Member] | Telstra [Member]
Subsequent Event [Line Items]
Ownership interest held by minority interest						35.00%

[1] During the three months ended March 31, 2018, the Company recognized a $957 million non-cash write-down of the carrying value of its investment in Foxtel. In the third quarter of fiscal 2018, as part of the long range planning process and in preparation for the Transaction, the Company assessed the long-term prospects for Foxtel, on both a stand-alone and combined basis. As a result of lower-than-expected revenues from certain new products and broadcast subscribers at Foxtel, the Company revised its outlook for Foxtel, which resulted in a reduction in expected future cash flows. Based on the revised projections, the Company concluded that the fair value of its investment in Foxtel declined below its carrying value. The assumptions utilized in the income approach valuation method were a discount rate of 10.25% and a long-term growth rate of 2.0%.