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Significant Accounting Policies - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Derivative [Line Items] |  |  |
Mortgage loan sale period | 30 days |  |
Advertising costs | $ 23 | $ 37 | $ 40
Preferred Stock, Shares Issued | 0 | 0 |
Preferred Stock, Shares Outstanding | 0 | 0 |
Preferred stock, Liquidation preference | $ 0 | $ 0 |
Interest Expense | $ 537 | $ 424 | 478
Preferred Stock, Shares Authorized | 10,000,000 | 10,000,000 |
Preferred Stock, Par or Stated Value Per Share | $ 0.00001 | $ 0.00001 |
Late Fee Income, Servicing Financial Asset, Statement of Income or Comprehensive Income [Extensible Enumeration] | Revenues |  |
Contractually Specified Servicing Fee Income, Statement of Income or Comprehensive Income [Extensible Enumeration] | Revenues |  |
Financial instruments, collection period | 39 months |  |
Debt |  |  |
Derivative [Line Items] |  |  |
Interest Expense | $ 485 | $ 361 | $ 370
Min |  |  |
Derivative [Line Items] |  |  |
Loan commitment period | 30 days |  |
Max |  |  |
Derivative [Line Items] |  |  |
Loan commitment period | 90 days |  |

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