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REAL ESTATE INVENTORY - Narrative (Details) $ in Millions	12 Months Ended
	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

X

- Definition

Inventory, Real Estate, Valuation Adjustment (Decrease) Increase

+ References

No definition available.

+ Details

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Namespace Prefix:	open_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of inventory reserves for last-in first-out (LIFO) and other inventory valuation methods.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(6))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 330
-SubTopic 10
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483080/330-10-50-1

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Balance Type:	credit
Period Type:	instant

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- References

No definition available.

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Namespace Prefix:	us-gaap_
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X

- Definition

Amount of the recorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 440
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482648/440-10-50-6

+ Details

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Period Type:	instant

X

- Definition

The minimum number of units that must be purchased, in connection with an unconditional purchase obligation that has been recognized for financial reporting purposes.

+ References

No definition available.

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