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Deferred Revenue - Schedule of Changes in Deferred Revenue (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Disaggregation Of Revenue [Roll Forward]    
Beginning balance $ 333 $ 307
Additions 870 928
Amortization (756) (760)
Ending balance 447 475
Listings Revenues    
Disaggregation Of Revenue [Roll Forward]    
Beginning balance 119 108
Additions 483 487
Amortization (370) (366)
Ending balance 232 229
Data Services and Other Revenues    
Disaggregation Of Revenue [Roll Forward]    
Beginning balance 130 93
Additions 282 335
Amortization (267) (270)
Ending balance 145 158
Mortgage technology    
Disaggregation Of Revenue [Roll Forward]    
Beginning balance 84 106
Additions 105 106
Amortization (119) (124)
Ending balance $ 70 $ 88