Additional Financial Information - Components of Other, Net Included in Statement of Operations (Detail) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2018
Other Income and Expenses [Line Items]
Remeasurement of equity securities			$ (21)	$ (23)	$ 35
Gain on sale of SEEKAsia	$ 32
Total Other, net			9	33	(324)
Proceeds from Sale of Investment Projects	122
Gain on Sale of Investments	$ 32
REA Group | Equity Method Investments
Other Income and Expenses [Line Items]
Gain on sale of REA Group's European business			20
Nonoperating Income (Expense)
Other Income and Expenses [Line Items]
Dividends received from equity security investments			3	24	0
Remeasurement of equity securities			(21)	(23)	0
Loss on the Transaction			0	0	(337)
Impairment of marketable securities and cost method investments		$ 0	0		(33)
Gain on sale of Australian property			0	16	0
Gain on sale of SEEKAsia			0	0	32
Other			7	16	14
Total Other, net			9	33	(324)
Gain on Sale of Investments			0	0	32
Nonoperating Income (Expense) | REA Group
Other Income and Expenses [Line Items]
Gain on sale of REA Group's European business			$ 20	$ 0	$ 0