Additional Financial Information - Components of Other, Net Included in Statement of Operations (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021	Sep. 30, 2021
Other Income and Expenses [Line Items]
Remeasurement of equity securities	$ (18)	$ 31	$ 1	$ 73
Total Other, net	$ 13	61	143	132
Move | Top Producer
Other Income and Expenses [Line Items]
(Loss) gain on sale of businesses		18		18
PropertyGuru Pte. Ltd. | REA Group
Other Income and Expenses [Line Items]
(Loss) gain on sale of businesses			$ 107
Ownership percentage	18.00%		18.00%		18.00%
Equity method investment, diluted ownership percentage	17.50%		17.50%		16.60%
Nonoperating Income (Expense)
Other Income and Expenses [Line Items]
Remeasurement of equity securities	$ (19)	33	$ 0	79
Dividends received from equity security investments	8	6	18	9
(Loss) gain on sale of businesses	0	18	98	18
Gain on remeasurement of previously-held interest	0	0	3	7
Gain on dilution of equity interests	15	0	15	0
Other	9	4	9	19
Total Other, net	13	$ 61	$ 143	$ 132
Other , net | PropertyGuru Pte. Ltd. | REA Group
Other Income and Expenses [Line Items]
Gain on dilution of equity interests	$ 15