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Other Assets - Narrative (Details) - USD ($) | 3 Months Ended | 5 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Jul. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Repurchase receivable | $ 560,000,000 | $ 266,000,000 |  | $ 560,000,000 | $ 266,000,000 |
Goodwill impairment charge |  | 0 | $ 0 | 0 |  | $ 0
Amortization expense |  | 23,000,000 | $ 2,000,000 | 50,000,000 |  | $ 5,000,000
Impairment of technology and intangible assets | 7,000,000 |  |  |  |  |
Real estate owned loans with government or GSE guarantee | 11,000,000 | $ 10,000,000 |  | 11,000,000 | 10,000,000 |
Pacific Union Financial, LLC |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Repurchase receivable | $ 336,000,000 |  |  | 336,000,000 |  |
Addition from acquisitions |  |  |  | 40,000,000 |  |
Intangible assets acquired |  |  |  | $ 13,000,000 |  |
Nationstar Mortgage Holdings Inc. |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Addition from acquisitions |  |  |  |  | 10,000,000 |
Intangible assets acquired |  |  |  |  | 103,000,000 |
Assurant Mortgage Solutions Group |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Addition from acquisitions |  |  |  |  | 13,000,000 |
Intangible assets acquired |  |  |  |  | $ 24,000,000 |

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