Additional Financial Information - Components of Other, Net (Detail) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Components of Other Income (Expense) [Line Items]
Write-down of available-for-salesecurities	[1]	$ (30)	$ (21)	$ (30)	$ (21)
Gain on sale of other businesses		0	11	0	11
Gain on sale of equity method investments		0	11	0	17
Other, net		(1)	2	7	13
Total Other, net		(31)	123	(23)	140
REA Group [Member]
Components of Other Income (Expense) [Line Items]
Gain on sale of REA Group's European business		$ 0	$ 120	$ 0	$ 120

[1] For the three and six months ended December 31, 2017 and 2016, the write-downs of available-for-sale securities were reclassified out of accumulated other comprehensive loss and included in Other, net in the Statement of Operations.