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Other Assets - Changes in the Carrying Amount of Goodwill (Details) - USD ($) $ in Millions | 3 Months Ended | 5 Months Ended | 7 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Jul. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018
Goodwill [Roll Forward] |  |  |  |  |
Balance - end of period |  | $ 23 |  | $ 120 | $ 23
Pacific Union Financial, LLC |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Addition from acquisitions |  |  |  | 40 |
Seterus Mortgage Servicing Platform And Related IBM Assets |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Addition from acquisitions |  |  |  | 2 |
Nationstar Mortgage Holdings Inc. |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Addition from acquisitions |  |  |  |  | 10
Measurement period adjustment related to merger | $ 55 |  |  | 55 |
Balance - end of period |  | 10 |  | 65 | 10
WMIH Corp |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Addition from acquisitions |  | 13 |  | 42 |
Measurement period adjustment related to merger |  | 0 |  | 55 |
Balance - end of period |  | $ 23 | $ 10 | $ 120 | $ 23
Nationstar Mortgage Holdings Inc. |  |  |  |  |
Goodwill [Roll Forward] |  |  |  |  |
Addition from acquisitions |  |  | 0 |  |
Measurement period adjustment related to merger |  |  | 0 |  |
Balance - end of period |  |  | $ 72 |  |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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- Definition Amount of increase (decrease) from adjustments after acquisition date under purchase accounting of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e961-128460 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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