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Other Assets - Narrative (Details) - USD ($) |  | 5 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Aug. 01, 2018 | Dec. 31, 2018 | Jul. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Addition from acquisitions |  | $ 13,000,000 |  |  |  |
Goodwill impairment charge |  | 0 | $ 0 |  | $ 0 | $ 0
Amortization expense |  | 23,000,000 | 2,000,000 |  | 5,000,000 | $ 8,000,000
Real estate owned loans with government or GSE guarantee |  | 10,000,000 |  | $ 10,000,000 | $ 15,000,000 |
Nationstar Mortgage Holdings Inc. |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets acquired | $ 103,000,000 |  | $ 0 |  |  |
Xome Holdings LLC | Assurant Mortgage Solutions Group |  |  |  |  |  |
Indefinite-lived Intangible Assets [Line Items] |  |  |  |  |  |
Intangible assets acquired |  | $ 24,000,000 |  | 24,000,000 |  |
Addition from acquisitions | $ 3,000,000 |  |  | $ 0 |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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