Loans Held for Investment - Narrative (Details) - USD ($)	3 Months Ended	12 Months Ended
Sep. 30, 2024	Dec. 31, 2023
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Securitized debt loans held for investment at cost	$ 11,300,000,000	$ 11,800,000,000
Loans held for investment
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Unpaid principal balance	11,557,126,000	12,028,480,000
Loans held for investment, at fair value
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Retained balance	0	0
Seasoned Subprime Residential Mortgage Loans \| Fair Value
Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]
Loans 90 or more days delinquent	$ 625,000,000	$ 645,000,000

Residential mortgage loans in the securitized loan portfolio that are 90 or more days past due.

No definition available.

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- Definition

Loans On Residential Real Estate held For Investment, Principal Amount

+ References

No definition available.

+ Details

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- Definition

Secured financing obligations carried at cost as of the reporting date consisting of securitizations that are collateralized by residential adjustable or fixed rate mortgage loans that have been placed in a trust and pay interest and principal to the debt holders of that securitization.

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No definition available.

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- Definition

Securitized Loans Held For Investment By Consolidated Variable Interest Entities [Line Items]

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No definition available.

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- Definition

Amount of beneficial interest received as consideration for transferring noncash financial asset. Includes, but is not limited to, trade receivable in securitization transaction.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 50
-Paragraph 4
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482913/230-10-50-4

+ Details

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- Details

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- Details

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- Details

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- Details

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