Additional Financial Information - Components of Other, Net Included in Statement of Operations (Detail) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Dec. 31, 2020	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2020	Sep. 30, 2021
Other Income and Expenses [Line Items]
Remeasurement of equity securities		$ (59)	$ 81	$ (21)
Total Other, net		52	143	9
REA Group | Equity Method Investments
Other Income and Expenses [Line Items]
Gain on sale of businesses			20
Move Inc | Top Producer
Other Income and Expenses [Line Items]
Gain on sale of businesses		18
REA Group | PropertyGuru Pte. Ltd.
Other Income and Expenses [Line Items]
Gain on sale of businesses		$ 107
Ownership percentage		18.00%			18.00%
Equity method investment, diluted ownership percentage		17.50%			16.60%
Nonoperating Income (Expense)
Other Income and Expenses [Line Items]
Remeasurement of equity securities		$ (59)	81	(21)
Dividends received from equity security investments		20	9	3
Gain on remeasurement of previously-held interest	$ 7	3	7	0
Gain on dilution of equity interests		15	0	0
Other		(25)	28	7
Total Other, net		52	143	9
Nonoperating Income (Expense) | REA Group
Other Income and Expenses [Line Items]
Gain on sale of businesses		98	$ 18	$ 20
Nonoperating Income (Expense) | REA Group | PropertyGuru Pte. Ltd.
Other Income and Expenses [Line Items]
Gain on dilution of equity interests		$ 15