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Mortgage Loans Held for Sale and Investment - Loans Held For Sale (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Jul. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Mortgage loans held for sale - UPB | $ 1,568 |  |  |
Mark-to-market adjustment | 63 |  |  |
Total mortgage loans held for sale | 1,631 | $ 1,514 |  |
UPB | 45 |  |  |
Fair Value | 42 |  |  |
Predecessor |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Mortgage loans held for sale - UPB |  |  | $ 1,837 |
Mark-to-market adjustment |  |  | 54 |
Total mortgage loans held for sale |  | $ 1,514 | 1,891 | $ 1,788
UPB |  |  | 66 |
Fair Value |  |  | 64 |
Ginnie Mae Repurchased Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
UPB | $ 40 |  | $ 64 |

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- Definition Fair Value, Mortgage Loans Held for Sale non-accrual status + References No definition available. + Details
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- Definition Loans Held-for-Sale, Mortgages, Fair Value Adjustment + References No definition available. + Details
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- Definition Loans Held-for-Sale, Mortgages, Unpaid Principal Balance + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The face amount of loans that will be sold to other entities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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