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Segment Information and Revenue - Revenue Categories (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Revenue:      
Revenue $ 1,958 $ 2,132 $ 1,624
Cost of revenue 367 323 255
Gross profit (loss) 1,591 1,809 1,369
Operating expenses:      
Sales and marketing 664 715 535
Technology and development 498 421 324
General and administrative 498 414 324
Impairment and restructuring costs 24 10 77
Acquisition-related costs 0 9 0
Integration costs 0 1 0
Total operating expenses 1,684 1,570 1,260
Income (loss) from continuing operations (93) 239 109
Other income, net 43 7 25
Interest expense (35) (128) (138)
Income (loss) from continuing operations before income taxes (85) 101 (3)
Operating Segments      
Operating expenses:      
Income (loss) from continuing operations before income taxes (100) 239 114
IMT | Operating Segments      
Revenue:      
Revenue 1,839 1,886 1,450
Cost of revenue 275 203 193
Gross profit (loss) 1,564 1,683 1,257
Operating expenses:      
Sales and marketing 572 552 441
Technology and development 438 318 260
General and administrative 375 258 225
Impairment and restructuring costs 12 0 74
Acquisition-related costs 0 9 0
Integration costs 0 1 0
Total operating expenses 1,397 1,138 1,000
Income (loss) from continuing operations 167 545 257
Other income, net (7) 0 5
Interest expense 0 0 0
Income (loss) from continuing operations before income taxes 160 545 262
IMT | Premier Agent | Operating Segments      
Revenue:      
Revenue 1,291 1,396 1,047
IMT | Rentals | Operating Segments      
Revenue:      
Revenue 274 264 222
IMT | Other | Operating Segments      
Revenue:      
Revenue 274 226 181
IMT | Mortgages | Operating Segments      
Revenue:      
Revenue 0 0 0
Mortgages | Operating Segments      
Revenue:      
Revenue 119 246 174
Cost of revenue 68 84 39
Gross profit (loss) 51 162 135
Operating expenses:      
Sales and marketing 79 109 60
Technology and development 50 32 23
General and administrative 85 72 44
Impairment and restructuring costs 4 1 3
Acquisition-related costs 0 0 0
Integration costs 0 0 0
Total operating expenses 218 214 130
Income (loss) from continuing operations (167) (52) 5
Other income, net 3 5 2
Interest expense (3) (5) (2)
Income (loss) from continuing operations before income taxes (167) (52) 5
Mortgages | Premier Agent | Operating Segments      
Revenue:      
Revenue 0 0 0
Mortgages | Rentals | Operating Segments      
Revenue:      
Revenue 0 0 0
Mortgages | Other | Operating Segments      
Revenue:      
Revenue 0 0 0
Mortgages | Mortgages | Operating Segments      
Revenue:      
Revenue 119 246 174
Homes | Operating Segments      
Revenue:      
Revenue 0 0 0
Cost of revenue 24 36 23
Gross profit (loss) (24) (36) (23)
Operating expenses:      
Sales and marketing 13 54 34
Technology and development 10 71 41
General and administrative 38 84 55
Impairment and restructuring costs 8 9 0
Acquisition-related costs 0 0 0
Integration costs 0 0 0
Total operating expenses 69 218 130
Income (loss) from continuing operations (93) (254) (153)
Other income, net 0 0 0
Interest expense 0 0 0
Income (loss) from continuing operations before income taxes (93) (254) (153)
Homes | Premier Agent | Operating Segments      
Revenue:      
Revenue 0 0 0
Homes | Rentals | Operating Segments      
Revenue:      
Revenue 0 0 0
Homes | Other | Operating Segments      
Revenue:      
Revenue 0 0 0
Homes | Mortgages | Operating Segments      
Revenue:      
Revenue $ 0 $ 0 $ 0