Additional Financial Information - Components of Other, Net Included in Statement of Operations (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Other Income and Expenses [Line Items]
Remeasurement of equity securities		$ (17)	$ 6	$ (22)	$ (23)
Total Other, net		13	3	19	30
Nonoperating Income (Expense) [Member]
Other Income and Expenses [Line Items]
Dividends received from equity security investments		1	1	2	24
Remeasurement of equity securities		(17)	6	(22)	(23)
Gain on sale of business	[1]	20	0	20	0
Gain on sale of Australian property		0	2	0	14
Other, net		9	(6)	19	15
Total Other, net		$ 13	$ 3	$ 19	$ 30

[1] During the three and nine months ended March 31, 2020, REA Group contributed its businesses located in Singapore and Indonesia into a joint venture with 99.co in return for an equity method investment in the combined entity. As a result of the deconsolidation of these entities, REA Group recognized a $20 million gain in Other, net.