Additional Financial Information - Components of Other, Net Included in Statement of Operations (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Other Income and Expenses [Line Items]
Remeasurement of equity securities	$ 31	$ (17)	$ 73	$ (22)
Total Other, net	61	13	132	19
REA Group Limited | Equity Method Investments
Other Income and Expenses [Line Items]
Gain on sale of businesses		20		20
Move | Top Producer
Other Income and Expenses [Line Items]
Gain on sale of businesses	18		18
Nonoperating Income (Expense)
Other Income and Expenses [Line Items]
Remeasurement of equity securities	33	(17)	79	(22)
Dividends received from equity security investments	6	1	9	2
Gain on sale of businesses	18	20	18	20
Gain on remeasurement of previously-held interest in Elara (Note 3)	0	0	7	0
Other	4	9	19	19
Total Other, net	$ 61	$ 13	$ 132	$ 19