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Mortgage Loans Held for Sale and Investment - Narrative (Details) - USD ($) $ in Millions | 1 Months Ended | 2 Months Ended | 3 Months Ended | 7 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Jul. 31, 2018 | Sep. 30, 2018 | Sep. 30, 2019 | Jul. 31, 2018 | Sep. 30, 2019 | Feb. 01, 2019 | Dec. 31, 2018
Servicing Assets at Fair Value [Line Items] |  |  |  |  |  |  |  |
Mortgage loans held for sale in foreclosure | $ 21 |  |  | $ 21 |  | $ 21 |  | $ 33
Sale of mortgage loans held for sale |  |  | $ 3,543 |  |  | 27,778 |  |
Gain on sale of mortgage loans held for sale |  |  | 35 |  |  | 367 |  |
Net gain on mortgage loans held for sale |  |  | 83 | 360 |  | 788 |  |
Mortgage loans held for investment in foreclosure |  |  |  |  |  |  |  | $ 15
Mortgage loans held for investment |  |  |  |  |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |  |  |  |  |
Sale of mortgage loans |  |  | 0 |  |  | 94 |  |
Transfers to mortgage loans held for sale |  |  | 0 |  |  | 12 |  |
Transfers to real estate owned |  |  | $ 0 |  |  | 5 |  |
Trust 2009-A |  |  |  |  |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |  |  |  |  |
Sale of mortgage loans held for sale | 130 |  |  |  |  |  |  |
Sale of mortgage loans | 94 |  |  |  |  |  |  |
Net gain on mortgage loans held for sale | 32 |  |  |  |  |  |  |
Transfers to mortgage loans held for sale | 12 |  |  |  |  |  |  |
Transfers to real estate owned | 5 |  |  |  |  |  |  |
Pacific Union |  |  |  |  |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |  |  |  |  |
Mortgage loans held for sale | 536 |  |  | $ 536 |  | 536 | $ 536 |
Servicing Segment |  |  |  |  |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |  |  |  |  |
Net gain on mortgage loans held for sale |  |  |  |  |  | $ 90 |  |
Servicing Segment | Trust 2009-A |  |  |  |  |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |  |  |  |  |
Net gain on mortgage loans held for sale | 21 |  |  |  |  |  |  |
Corporate/Other | Trust 2009-A |  |  |  |  |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |  |  |  |  |
Net gain on mortgage loans held for sale | $ 11 |  |  |  |  |  |  |
Nationstar Mortgage Holdings Inc. |  |  |  |  |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |  |  |  |  |
Sale of mortgage loans held for sale |  |  |  |  | $ 13,382 |  |  |
Gain on sale of mortgage loans held for sale |  |  |  |  | 127 |  |  |
Net gain on mortgage loans held for sale |  | $ 44 |  |  | $ 295 |  |  |

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- Definition The net gain (loss) resulting from a sale of loans, including adjustments to record loans classified as held-for-sale at the lower-of-cost-or-market and fair value adjustments to loan held for investment purposes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13(h)) -URI http://asc.fasb.org/extlink&oid=116637391&loc=SL114874048-224260 Reference 2: 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=118932676&loc=d3e3602-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.3(a)) -URI http://asc.fasb.org/extlink&oid=116637232&loc=SL114874131-224263 + Details
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