COMMON STOCK AND STOCKHOLDERS' (DEFICIT) EQUITY - SCHEDULE OF SHARE-BASED COMPENSATION (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2022 |
Mar. 31, 2021 |
|
| Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||
| Share-based compensation | $ 220 | $ 9 |
| Brokerage and transaction | ||
| Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||
| Share-based compensation | 1 | 0 |
| Technology and development | ||
| Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||
| Share-based compensation | 82 | 1 |
| Operations | ||
| Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||
| Share-based compensation | 4 | 0 |
| Marketing | ||
| Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||
| Share-based compensation | 5 | 0 |
| General and administrative | ||
| Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] | ||
| Share-based compensation | $ 128 | $ 8 |