Property and Equipment, Net - Components of Property and Equipment, Net (Details) - USD ($) $ in Millions |
Dec. 31, 2025 |
Dec. 31, 2024 |
|---|---|---|
| Property Plant And Equipment [Line Items] | ||
| Property and equipment, gross | $ 830 | $ 767 |
| Less: accumulated depreciation | (620) | (567) |
| Total | 210 | 200 |
| Capitalized Website Development | ||
| Property Plant And Equipment [Line Items] | ||
| Property and equipment, gross | 615 | 558 |
| Total | 127 | 115 |
| Finance Lease Right-of-Use Asset | ||
| Property Plant And Equipment [Line Items] | ||
| Property and equipment, gross | 114 | 114 |
| Leasehold Improvements | ||
| Property Plant And Equipment [Line Items] | ||
| Property and equipment, gross | 28 | 24 |
| Computer Equipment and Purchased Software | ||
| Property Plant And Equipment [Line Items] | ||
| Property and equipment, gross | 56 | 56 |
| Furniture, Office Equipment and Other | ||
| Property Plant And Equipment [Line Items] | ||
| Property and equipment, gross | $ 17 | $ 15 |