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Mortgage Loans Held for Sale and Investment - Narrative (Details) - USD ($) | 5 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2018 | Jul. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Servicing Assets at Fair Value [Line Items] |  |  |  |
Mortgage loans held for sale in foreclosure | $ 33,000,000 |  | $ 51,000,000 |
Sale of mortgage loans held for sale | 9,397,000,000 | $ 13,382,000,000 | 20,772,000,000 | $ 21,942,000,000
Gain on sale of mortgage loans held for sale | 93,000,000 | 127,000,000 | 454,000,000 | $ 539,000,000
Mortgage loans held for investment in foreclosure | 15,000,000 |  | 22,000,000 |
Ginnie Mae HECM |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |
Delinquent loans acquired | 56,000,000 | 118,000,000 | 316,000,000 |
Delinquent loans securitized or sold | 95,000,000 | 151,000,000 | 341,000,000 |
Purchased loans that have re-performed | $ 70,000,000 |  | 227,000,000 |
Mortgage Loans Held for Investment |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |
Reclassifications from nonaccretable discount |  | $ 1,000,000 | $ 1,000,000 |

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- Definition mortgage loans held for investment in foreclosure, amount + References No definition available. + Details
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- Definition Mortgage Loans Held for Sale, Delinquent Loans Acquired + References No definition available. + Details
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- Definition Mortgage Loans Held for Sale, Delinquent Loans Securitized or Sold + References No definition available. + Details
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- Definition Mortgage Loans Held for Sale, Purchased Loans that have Re-performed + 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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- Definition The cash inflow from sales of loans that are secured with real estate mortgages and are held with the intention to resell in the near future. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3461-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3536-108585 + Details
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