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BUSINESS COMBINATIONS (Details) $ / shares in Units, $ in Millions					12 Months Ended
	Nov. 04, 2022 USD ($)	Nov. 03, 2021 USD ($)	Sep. 03, 2021 USD ($)	Dec. 18, 2020 USD ($) $ / shares shares	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)
Business Combination, Separately Recognized Transactions [Line Items]
GOODWILL					$ 4	$ 60
Common Stock
Business Combination, Separately Recognized Transactions [Line Items]
Equity issuance costs					$ 0	$ 29	$ 43
Transaction with Social Capital Hedosophia Holdings Corp. II I Common Stock
Business Combination, Separately Recognized Transactions [Line Items]
Consideration received due to reverse recapitalization				$ 377
PIPE shares issued by Social Capital Hedosophia Holdings Corp. II (in shares) | shares				60,005,000
Common stock price per PIPE Shares (in dollars per share) | $ / shares				$ 10.00
Total PIPE shares investment				$ 600
Exchange ratio upon business combination with Social Capital Hedosophia Holdings Corp. II				1.618
Opendoor Technologies Inc. Common Stock | Common Stock
Business Combination, Separately Recognized Transactions [Line Items]
Equity issuance costs				$ 44
Services Labs, Inc.
Business Combination, Separately Recognized Transactions [Line Items]
Acquisition of outstanding equity (in percent)			100.00%
Cash consideration			$ 22
Pro.com
Business Combination, Separately Recognized Transactions [Line Items]
GOODWILL			16
Pro.com | Technology-Based Intangible Assets
Business Combination, Separately Recognized Transactions [Line Items]
Acquired intangible assets			$ 4
Remaining Weighted Average Useful Life (Years)			1 year
RedDoor
Business Combination, Separately Recognized Transactions [Line Items]
Total PIPE shares investment		$ 15
GOODWILL		13
Cash consideration paid out after closing		$ 2
Length of time after closing when deferred payment is due	1 year	1 year
RedDoor | Technology-Based Intangible Assets
Business Combination, Separately Recognized Transactions [Line Items]
Acquired intangible assets		$ 3
Remaining Weighted Average Useful Life (Years)		1 year
TaxProper
Business Combination, Separately Recognized Transactions [Line Items]
Total PIPE shares investment	$ 10
GOODWILL	2
Cash consideration paid out after closing	3
TaxProper | Technology-Based Intangible Assets
Business Combination, Separately Recognized Transactions [Line Items]
Acquired intangible assets	$ 7
Remaining Weighted Average Useful Life (Years)	2 years

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