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Principles of Consolidation - Additional Information (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) entity | Sep. 30, 2021 USD ($) entity partnership
Variable Interest Entity [Line Items] |  |
Number of partnerships consolidated | partnership |  | 2
VIE, ownership interest rate (as a percent) |  | 80.00%
Loans for sale at fair value that were acquired | $ 151 | $ 151
Variable Interest Entity, Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Number of partnerships consolidated | partnership |  | 2
Variable Interest Entity, Not Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Number of entities called | entity | 2 | 6
Number of securitization entities to which asset transferred (in entities) | entity | 50 | 50
Unpaid principal balance of loans purchased | $ 66 | $ 167
Gain related to called security | $ 6 | $ 15
CAFL | Variable Interest Entity, Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Number of entities called | entity | 0 | 1
Loans transferred to held-for-sale |  | $ 45

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