WARRANTS (Details) $ / shares in Units, $ in Millions			3 Months Ended		9 Months Ended
	Jul. 28, 2022 d $ / shares shares	Jul. 09, 2021 USD ($) $ / shares shares	Sep. 30, 2022 USD ($) $ / shares shares	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) $ / shares shares	Sep. 30, 2021 USD ($)	Dec. 31, 2021 $ / shares	Jan. 12, 2021 shares
Class of Warrant or Right [Line Items]
Warrants to purchase shares (in shares)								19,933,333
Common stock, par value (in dollars per share) | $ / shares		$ 0.0001	$ 0.0001		$ 0.0001		$ 0.0001
Proceeds from warrant exercise | $		$ 22			$ 0	$ 22
Warrant fair value adjustment | $			$ 0	$ (3)	$ 0	$ (12)
Public Warrants
Class of Warrant or Right [Line Items]
Warrants to purchase shares (in shares)		13,799,947
Warrants exercised (in shares)		874,739
Exercise price of warrants (in dollars per share) | $ / shares		$ 11.50
Warrants exercised on a cashless basis (in shares)		12,521,776
Common stock received in exchange for warrants (in shares)		4,452,659
Private Warrants
Class of Warrant or Right [Line Items]
Warrants to purchase shares (in shares)		6,133,333
Warrants exercised (in shares)		1,073,333
Exercise price of warrants (in dollars per share) | $ / shares		$ 11.50
Warrants exercised on a cashless basis (in shares)		5,060,000
Common stock received in exchange for warrants (in shares)		1,799,336
Marketing Warrants | Zillow
Class of Warrant or Right [Line Items]
Warrants to purchase shares (in shares)			0		0
Number of shares authorized to be purchased by warrant agreement (in shares)	6,000,000
Volume-weighted average price, days | d	30
Marketing Warrants | Zillow | Minimum
Class of Warrant or Right [Line Items]
Exercise price of warrants (in dollars per share) | $ / shares	$ 15
Marketing Warrants | Zillow | Maximum
Class of Warrant or Right [Line Items]
Exercise price of warrants (in dollars per share) | $ / shares	$ 30