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Goodwill and Intangible Assets - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Goodwill [Line Items] |  |  |
Goodwill | $ 141 | $ 141 | $ 120
Addition from acquisitions(1) |  | 21 |
Impairment of goodwill |  | 0 | 0
Amortization expense |  | 7 | 6
Impairment of technology and intangible assets |  | 0 | 0
Rushmore |  |  |
Goodwill [Line Items] |  |  |
Payments to Acquire Intangible Assets |  | 23 |
Roosevelt [Member] |  |  |
Goodwill [Line Items] |  |  |
Addition from acquisitions(1) | 21 |  |
Payments to Acquire Intangible Assets |  | 4 |
Servicing |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 85 | 85 | 80
Addition from acquisitions(1) |  | 5 |
Servicing | Roosevelt [Member] |  |  |
Goodwill [Line Items] |  |  |
Addition from acquisitions(1) |  | 5 |
Originations |  |  |
Goodwill [Line Items] |  |  |
Goodwill | 28 | 28 | 28
Addition from acquisitions(1) |  | 0 |
Corporate/Other(2) |  |  |
Goodwill [Line Items] |  |  |
Goodwill | $ 28 | 28 | $ 12
Addition from acquisitions(1) |  | 16 |
Corporate/Other(2) | Roosevelt [Member] |  |  |
Goodwill [Line Items] |  |  |
Addition from acquisitions(1) |  | $ 16 |

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