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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 | 5 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Jul. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2018 | Jul. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2017
Servicing Assets at Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage loans held for sale in foreclosure |  |  |  | $ 21 |  |  |  | $ 33 |  |  | $ 33 |  | $ 21 |
Sale of mortgage loans held for sale |  |  |  |  |  |  |  |  |  |  | 9,397 | $ 13,382 | 41,809 | $ 20,772
Gain on sale of mortgage loans held for sale |  |  |  |  |  |  |  |  |  |  | 93 | 127 | 549 | 454
Net gain on mortgage loans held for sale |  | $ 44 | $ 83 | $ 310 | $ 360 | $ 262 | $ 166 | 93 | $ 127 | $ 124 | 176 | $ 295 | 1,098 | $ 607
Mortgage loans held for investment in foreclosure |  |  |  |  |  |  |  | $ 15 |  |  | 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, Legacy Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of mortgage loans held for sale | $ 130 |  |  |  |  |  |  |  |  |  |  |  |  |
Net gain on mortgage loans held for sale | 32 |  |  |  |  |  |  |  |  |  |  |  |  |
Sale of mortgage loans | 94 |  |  |  |  |  |  |  |  |  |  |  |  |
Transfers to mortgage loans held for sale | 12 |  |  |  |  |  |  |  |  |  |  |  |  |
Transfers to real estate owned | 5 |  |  |  |  |  |  |  |  |  |  |  |  |
Servicing | Trust 2009-A, Legacy Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net gain on mortgage loans held for sale | 21 |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate and Other | Trust 2009-A, Legacy Portfolio |  |  |  |  |  |  |  |  |  |  |  |  |  |
Servicing Assets at Fair Value [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net gain on mortgage loans held for sale | $ 11 |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition Fair Value, Measurement With Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfer To Mortgage Loans Held For Sale + References No definition available. + Details
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- Definition Amount of sale of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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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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