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RELATED PARTY TRANSACTIONS - Pre-Closing Bridge Notes (Details)	Nov. 02, 2021 USD ($)	Feb. 11, 2021 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Series D Preferred Stock \| Subsequent event
RELATED PARTY TRANSACTIONS
Percent of discount			50.00%	50.00%
If the proposed Business Combination is not completed on or before September 30, 2023 \| Subsequent event \| Better HoldCo, Inc.
RELATED PARTY TRANSACTIONS
Percent of discount			75.00%
Amount of pre-money equity valuation			$ 6,900,000,000
If the proposed Business Combination is not completed on or before September 30, 2023 \| Subsequent event \| Better HoldCo, Inc. \| Common Stock
RELATED PARTY TRANSACTIONS
Percent of discount			75.00%
Amount of pre-money equity valuation			$ 6,900,000,000	$ 6,900,000,000
If the proposed Business Combination is not completed on or before September 30, 2023 \| Class B ordinary shares \| Subsequent event \| Better HoldCo, Inc.
RELATED PARTY TRANSACTIONS
Percent of discount			75.00%	75.00%
Amount of pre-money equity valuation				$ 6,900,000,000
If the proposed Business Combination is not completed on or before September 30, 2023 \| Class B ordinary shares \| Subsequent event \| Better HoldCo, Inc. \| Common Stock
RELATED PARTY TRANSACTIONS
Amount of pre-money equity valuation			$ 6,900,000,000
Better HoldCo, Inc. \| If the proposed Business Combination is not completed on or before September 30, 2023 \| Class B ordinary shares \| Subsequent event
RELATED PARTY TRANSACTIONS
Amount of pre-money equity valuation			$ 6,900,000,000
Bridge Note Purchase Agreement \| SB Northstar LP
RELATED PARTY TRANSACTIONS
Bridge notes purchased	$ 650,000,000	$ 650,000,000
Bridge Note Purchase Agreement \| Better HoldCo, Inc.
RELATED PARTY TRANSACTIONS
Conversion rate of bridge notes into Better Class A common stock		1
Consideration amount		$ 10
Bridge Note Purchase Agreement \| Sponsor
RELATED PARTY TRANSACTIONS
Bridge notes purchased	100,000,000	100,000,000
Bridge Note Purchase Agreement \| Better HoldCo, Inc.
RELATED PARTY TRANSACTIONS
Bridge notes issued	$ 750,000,000	$ 750,000,000
Conversion rate of bridge notes into Better Class A common stock	1
Consideration amount	$ 10