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Mortgage Loans Held for Sale and Investment - Narrative (Details) - USD ($) | 1 Months Ended | 2 Months Ended | 7 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 31, 2018 | Sep. 30, 2018 | Jul. 31, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Servicing Assets at Fair Value [Line Items] |  |  |  |  |
Mortgage loans held for sale in foreclosure |  | $ 33,000,000 |  |  |
Sale of mortgage loans held for sale |  | 3,543,000,000 |  |  |
Gain on sale of mortgage loans held for sale |  | 35,000,000 |  |  |
Mortgage loans held for investment in foreclosure |  | 15,000,000 |  |  |
Ginnie Mae Loans |  |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |  |
Delinquent loans acquired |  | 29,000,000 |  |  |
Delinquent loans securitized or sold |  | 32,000,000 |  |  |
Purchased loans that have re-performed |  | $ 58,000,000 |  |  |
Mortgage loans held for investment, net |  |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |  |
Reclassifications from non-accretable discount |  |  | $ 1,000,000 | $ 1,000,000 |
Provision for reserves |  |  |  | 0 |
Predecessor |  |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |  |
Mortgage loans held for sale in foreclosure |  |  |  |  | $ 51,000,000
Sale of mortgage loans held for sale | $ 1,891,000,000 |  | 13,382,000,000 | 15,470,000,000 |
Gain on sale of mortgage loans held for sale | $ 13,000,000 |  | 127,000,000 | 363,000,000 |
Mortgage loans held for investment in foreclosure |  |  |  |  | $ 22,000,000
Predecessor | Ginnie Mae Loans |  |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |  |
Delinquent loans acquired |  |  | 118,000,000 | 236,000,000 |
Delinquent loans securitized or sold |  |  | $ 154,000,000 | 253,000,000 |
Purchased loans that have re-performed |  |  |  | $ 59,000,000 |

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- Definition Allowance for Loan Losses of Mortgage Loans Held for Investment + References No definition available. + Details
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- Definition Amount of increase of reclassification from nonaccretable difference to the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities with evidence of deterioration of credit quality. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
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- Definition Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL49126937-111524 + Details
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