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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, 2023
Jun. 30, 2022
Jun. 30, 2021
Sep. 30, 2021
Aug. 31, 2021
Other Income and Expenses [Line Items]            
Remeasurement of equity securities   $ (9) $ (59) $ 81    
Total Other, net   1 52 143    
REA Group | PropertyGuru Pte. Ltd.            
Other Income and Expenses [Line Items]            
Gain on sale of businesses     $ 107      
Ownership percentage     18.00%   18.00% 18.00%
Equity method investment, diluted ownership percentage     17.50%     16.60%
Move Inc | Top Producer            
Other Income and Expenses [Line Items]            
Gain on sale of businesses       18    
Nonoperating Income (Expense)            
Other Income and Expenses [Line Items]            
Remeasurement of equity securities   (9) $ (59) 81    
Dividends received from equity security investments   6 20 9    
Gain on sale of businesses   0 98 18    
Gain on remeasurement of previously-held interest $ 7 0 3 7    
Gain on dilution of PropertyGuru investment   0 15 0    
Other   4 (25) 28    
Total Other, net   $ 1 52 $ 143    
Nonoperating Income (Expense) | REA Group | PropertyGuru Pte. Ltd.            
Other Income and Expenses [Line Items]            
Gain on dilution of PropertyGuru investment     $ 15