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Mortgage Servicing Rights and Related Liabilities - Narrative (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Forward MSRs Sold |  |
Servicing Assets at Fair Value [Line Items] |  |
Unpaid principal balance sold | $ 1,070,000,000 | $ 35,152,000,000
Forward MSRs Sold, Subservicing Retained |  |
Servicing Assets at Fair Value [Line Items] |  |
Principal amount outstanding on mortgage servicing rights | 960,000,000 | 20,560,000,000
Reverse mortgage interests, net |  |
Servicing Assets at Fair Value [Line Items] |  |
Principal amount outstanding on mortgage servicing rights | 18,091,000,000 | 22,725,000,000
Mortgage Servicing Right Liability |  |
Servicing Assets at Fair Value [Line Items] |  |
Excess spread financing - fair value | 934,000,000 | 1,311,000,000
Mortgage servicing rights financing - fair value | 33,000,000 | 37,000,000
Mortgage Servicing Rights |  |
Servicing Assets at Fair Value [Line Items] |  |
Principal amount outstanding on mortgage servicing rights | 271,189,000,000 | 296,782,000,000
Impairment | $ 0 | $ 0

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- Definition Mortgage Servicing Rights Liability Resulting from Sale or Securitization of Servicer Advances, Rights not Accounted for as a Sale + References No definition available. + Details
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- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details
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