Deferred Revenue - Schedule of Changes in Deferred Revenue (Details) - USD ($) $ in Millions |
6 Months Ended | |
|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Disaggregation Of Revenue [Roll Forward] | ||
| Beginning balance | $ 292 | $ 333 |
| Additions | 837 | 769 |
| Amortization | (476) | (501) |
| Ending balance | 653 | 601 |
| Listings Revenues | ||
| Disaggregation Of Revenue [Roll Forward] | ||
| Beginning balance | 119 | 119 |
| Additions | 488 | 470 |
| Amortization | (257) | (246) |
| Ending balance | 350 | 343 |
| Data Services and Other Revenues | ||
| Disaggregation Of Revenue [Roll Forward] | ||
| Beginning balance | 101 | 130 |
| Additions | 281 | 224 |
| Amortization | (154) | (173) |
| Ending balance | 228 | 181 |
| Mortgage technology | ||
| Disaggregation Of Revenue [Roll Forward] | ||
| Beginning balance | 72 | 84 |
| Additions | 68 | 75 |
| Amortization | (65) | (82) |
| Ending balance | $ 75 | $ 77 |