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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions | 12 Months Ended | 24 Months Ended
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2015
Significant Accounting Policies [Line Items] |  |  |  |
Risk-sharing arrangement term |  |  |  | 10 years
SPE, assets | $ 28 | $ 30 |  |
SPE, liabilities | $ 6 | 6 |  |
Employee Stock Purchase Plan, percentage of common stock fair value that employees can purchase |  |  | 85.00% |
Employees maximum 401(k) contribution | 100.00% |  |  |
Employer matching contributions | $ 2 | $ 2 | $ 1 |
Minimum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Business purpose loans term | 3 years |  |  |
Business purpose maturity loan term | 12 years |  |  |
Percentage of losses assumed on pool of loans sold |  |  |  | 1.00%
Incentive Plan, awards vesting period (in years) | 3 years |  |  |
Maximum |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |
Business purpose loans term | 30 years |  |  |
Business purpose maturity loan term | 36 months |  |  |
Percentage of losses assumed on pool of loans sold |  |  |  | 2.25%
Incentive Plan, awards vesting period (in years) | 4 years |  |  |

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- Definition Significant Accounting Policies [Line Items] + References No definition available. + Details
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