Deferred Revenue - Schedule of Changes in Deferred Revenue (Details) - USD ($) $ in Millions |
9 Months Ended | |
|---|---|---|
Sep. 30, 2026 |
Sep. 30, 2025 |
|
| Disaggregation Of Revenue [Roll Forward] | ||
| Beginning balance | $ 292 | $ 333 |
| Additions | 936 | 870 |
| Amortization | (731) | (756) |
| Ending balance | 497 | 447 |
| Listings Revenues | ||
| Disaggregation Of Revenue [Roll Forward] | ||
| Beginning balance | 119 | 119 |
| Additions | 502 | 483 |
| Amortization | (387) | (370) |
| Ending balance | 234 | 232 |
| Data Services and Other Revenues | ||
| Disaggregation Of Revenue [Roll Forward] | ||
| Beginning balance | 101 | 130 |
| Additions | 335 | 282 |
| Amortization | (245) | (267) |
| Ending balance | 191 | 145 |
| Mortgage technology | ||
| Disaggregation Of Revenue [Roll Forward] | ||
| Beginning balance | 72 | 84 |
| Additions | 99 | 105 |
| Amortization | (99) | (119) |
| Ending balance | $ 72 | $ 70 |