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Investment in Equity Method Investee (Narrative) (Details) - USD ($) |  |  |  | 9 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Jun. 01, 2021 | May 03, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 21, 2020
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Investment in equity method investee |  |  |  |  |  | $ 250,000,000
Ownership percentage | 15.00% |  | 4.90% | 15.00% |  |
Capital contribution |  |  | $ 5,000,000 | $ 18,512,000 |  |
UPB of loans acquired | $ 72,200,000,000 |  |  | 72,200,000,000 | $ 9,900,000,000 |
UPB of MSRs sold |  |  |  | $ 18,000,000 | $ 55,700,000 |
MAV Canopy HoldCo I, LLC |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership percentage | 15.00% |  |  | 15.00% |  |
MAV Canopy HoldCo I, LLC | Oaktree |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Ownership percentage | 85.00% |  |  | 85.00% |  |
Fannie Mae MSRs |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
UPB of MSRs sold |  | $ 4,100,000,000 |  |  |  |
GSE MSR Portfolio |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
UPB of MSRs sold | $ 8,200,000,000 |  |  |  |  |
Forward Bulk Servicing Rights Purchase and Sale Agreement |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
UPB of MSRs sold | $ 1,300,000,000 |  |  |  |  |
Maximum |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Management fee expense |  |  |  | $ 500,000 |  |

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109237563&loc=d3e33749-111570 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 25 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120311839&loc=d3e8813-108599 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.12) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount of expenses related to the managing member or general partner for management of the day-to-day business functions of the limited liability company (LLC) or limited partnership (LP). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 850 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864 + Details
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- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3213-108585 + Details
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