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REAL ESTATE INVENTORY - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2023 USD ($) home | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Inventory Disclosure [Abstract] |  |  |
Inventory adjustments | $ 27 | $ 459 |
Amount of homes purchased under contract | home | 2,114 |  |
Aggregate purchase price for homes | $ 653 |  |
Valuation adjustments | $ 65 | $ 737 | $ 56

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