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Segment Information and Revenue - Revenue Categories (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Revenue:        
Total revenue $ 483 $ 550 $ 1,523 $ 1,597
Cost of revenue 89 82 278 228
Gross profit 394 468 1,245 1,369
Operating expenses:        
Sales and marketing 165 205 502 532
Technology and development 142 101 369 319
General and administrative 138 104 370 303
Acquisition-related costs 0 3 0 8
Total operating expenses 445 413 1,255 1,162
Income (loss) from continuing operations (51) 55 (10) 207
Other income, net 12 2 19 5
Interest expense (9) (29) (26) (99)
Income (loss) from continuing operations before income taxes (48) 13 (17) 96
Operating Segments        
Operating expenses:        
Income (loss) from continuing operations before income taxes (54) 55 (14) 206
IMT | Operating Segments        
Revenue:        
Total revenue 457 480 1,422 1,402
Cost of revenue 67 51 203 141
Gross profit 390 429 1,219 1,261
Operating expenses:        
Sales and marketing 145 159 430 413
Technology and development 126 75 323 244
General and administrative 110 62 274 189
Restructuring costs     6 0
Acquisition-related costs 0 3 0 8
Total operating expenses 381 299 1,033 854
Income (loss) from continuing operations 9 130 186 407
Other income, net (4) 0 (4) 0
Interest expense 0 0 0 0
Income (loss) from continuing operations before income taxes 5 130 182 407
IMT | Premier Agent | Operating Segments        
Revenue:        
Total revenue 312 359 1,008 1,042
IMT | Rentals | Operating Segments        
Revenue:        
Total revenue 74 67 206 204
IMT | Other | Operating Segments        
Revenue:        
Total revenue 71 54 208 156
IMT | Mortgages | Operating Segments        
Revenue:        
Total revenue 0 0 0 0
Mortgages segment | Operating Segments        
Revenue:        
Total revenue 26 70 101 195
Cost of revenue 17 22 54 62
Gross profit 9 48 47 133
Operating expenses:        
Sales and marketing 20 29 61 81
Technology and development 16 7 37 24
General and administrative 25 18 63 53
Restructuring costs     2 0
Acquisition-related costs 0 0 0 0
Total operating expenses 61 54 163 158
Income (loss) from continuing operations (52) (6) (116) (25)
Other income, net 1 1 2 3
Interest expense 0 (1) (2) (4)
Income (loss) from continuing operations before income taxes (51) (6) (116) (26)
Mortgages segment | Premier Agent | Operating Segments        
Revenue:        
Total revenue 0 0 0 0
Mortgages segment | Rentals | Operating Segments        
Revenue:        
Total revenue 0 0 0 0
Mortgages segment | Other | Operating Segments        
Revenue:        
Total revenue 0 0 0 0
Mortgages segment | Mortgages | Operating Segments        
Revenue:        
Total revenue 26 70 101 195
Homes | Operating Segments        
Revenue:        
Total revenue 0 0 0 0
Cost of revenue 5 9 21 25
Gross profit (5) (9) (21) (25)
Operating expenses:        
Sales and marketing 0 17 11 38
Technology and development 0 19 9 51
General and administrative 3 24 33 61
Restructuring costs     6 0
Acquisition-related costs 0 0 0 0
Total operating expenses 3 60 59 150
Income (loss) from continuing operations (8) (69) (80) (175)
Other income, net 0 0 0 0
Interest expense 0 0 0 0
Income (loss) from continuing operations before income taxes (8) (69) (80) (175)
Homes | Premier Agent | Operating Segments        
Revenue:        
Total revenue 0 0 0 0
Homes | Rentals | Operating Segments        
Revenue:        
Total revenue 0 0 0 0
Homes | Other | Operating Segments        
Revenue:        
Total revenue 0 0 0 0
Homes | Mortgages | Operating Segments        
Revenue:        
Total revenue $ 0 $ 0 $ 0 $ 0