Income Taxes - Net Impact of Tax Refund and Interest, Net of Tax, Recorded in Statement of Operations (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2014		Dec. 31, 2013
Components Of Income Tax Expense Benefit [Line Items]
Other, net	$ 0	[1]	$ (238)	[1]	$ 0	[1]	$ (721)	[1]
21st Century Fox [Member]
Components Of Income Tax Expense Benefit [Line Items]
Other, net			(238)				(721)
Income tax benefit			238				721
Net impact to the Statement of Operations			$ 0				$ 0

[1] See Note 12-Income Taxes