Home Equity Investments (HEI) - Schedule of Geographic Concentration of HEI (Details) - Geographic Concentration Risk - Investments Benchmark	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
HEI at Redwood
Schedule of Equity Method Investments [Line Items]
Concentration risk (as a percent)	100.00%	100.00%
HEI at Redwood | California
Schedule of Equity Method Investments [Line Items]
Concentration risk (as a percent)	49.00%	48.00%
HEI at Redwood | Florida
Schedule of Equity Method Investments [Line Items]
Concentration risk (as a percent)	12.00%	12.00%
HEI at Redwood | Washington
Schedule of Equity Method Investments [Line Items]
Concentration risk (as a percent)	6.00%	6.00%
HEI at Redwood | Colorado
Schedule of Equity Method Investments [Line Items]
Concentration risk (as a percent)	6.00%	6.00%
HEI at Redwood | Arizona
Schedule of Equity Method Investments [Line Items]
Concentration risk (as a percent)	5.00%	5.00%
HEI at Redwood | New York
Schedule of Equity Method Investments [Line Items]
Concentration risk (as a percent)	4.00%	4.00%
HEI at Redwood | Other states (none greater than 5%)
Schedule of Equity Method Investments [Line Items]
Concentration risk (as a percent)	18.00%	19.00%
Securitized HEI
Schedule of Equity Method Investments [Line Items]
Concentration risk (as a percent)	100.00%	100.00%
Securitized HEI | California
Schedule of Equity Method Investments [Line Items]
Concentration risk (as a percent)	47.00%	47.00%
Securitized HEI | Florida
Schedule of Equity Method Investments [Line Items]
Concentration risk (as a percent)	7.00%	7.00%
Securitized HEI | Washington
Schedule of Equity Method Investments [Line Items]
Concentration risk (as a percent)	7.00%	7.00%
Securitized HEI | Colorado
Schedule of Equity Method Investments [Line Items]
Concentration risk (as a percent)	4.00%	4.00%
Securitized HEI | Arizona
Schedule of Equity Method Investments [Line Items]
Concentration risk (as a percent)	6.00%	6.00%
Securitized HEI | New York
Schedule of Equity Method Investments [Line Items]
Concentration risk (as a percent)	7.00%	7.00%
Securitized HEI | Other states (none greater than 5%)
Schedule of Equity Method Investments [Line Items]
Concentration risk (as a percent)	22.00%	22.00%