Other Financial Data - Summary of Components of Fixed Assets, Net (Details) - USD ($) $ in Millions |
Dec. 31, 2021 |
Dec. 31, 2020 |
|---|---|---|
| Property Plant And Equipment [Line Items] | ||
| Total Fixed assets, gross | $ 267 | $ 546 |
| Less: Accumulated depreciation | 31 | 212 |
| Fixed assets, net | 236 | 334 |
| Capitalized Software | ||
| Property Plant And Equipment [Line Items] | ||
| Total Fixed assets, gross | 55 | 242 |
| Leasehold Improvements | ||
| Property Plant And Equipment [Line Items] | ||
| Total Fixed assets, gross | 40 | 63 |
| Computer Equipment | ||
| Property Plant And Equipment [Line Items] | ||
| Total Fixed assets, gross | 102 | 192 |
| Furniture, Fixtures and Equipment | ||
| Property Plant And Equipment [Line Items] | ||
| Total Fixed assets, gross | 12 | 21 |
| Construction in Progress | ||
| Property Plant And Equipment [Line Items] | ||
| Total Fixed assets, gross | $ 58 | $ 28 |