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Business Combinations and Asset Acquisitions (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 31, 2023 | Dec. 31, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Oct. 31, 2024 | Aug. 01, 2023
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill, Acquired During Period |  |  |  |  |  |  |  | $ 21,000,000 |  |  |
Business Combination, Bargain Purchase, Gain Recognized, Amount |  |  |  |  |  |  | $ 4,000,000 | 96,000,000 | $ 0 |  |
Business Combination, Bargain Purchase, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  |  | Other income (expense), net |  |  |  |  |  |  |
Flagstar Bank, N.A. |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Asset Acquisition, Consideration Transferred |  | $ 1,300,000,000 |  |  |  |  |  |  |  |  |
Rushmore Loan Management Services, LLC [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Asset Acquisition, Consideration Transferred |  |  |  |  |  | $ 34,000,000 |  |  |  |  |
Customer-Related Intangible Assets | Flagstar Bank, N.A. |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Asset Acquisition, Assets Acquired, Amount |  |  |  |  |  |  |  |  |  | $ 101,000,000 |
Mortgage servicing rights | Flagstar Bank, N.A. |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Asset Acquisition, Assets Acquired, Amount |  |  |  |  |  |  |  |  |  | $ 1,200,000,000 |
Corporate/Other(2) |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill, Acquired During Period |  |  |  |  |  |  |  | 16,000,000 |  |  |
Servicing |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill, Acquired During Period |  |  |  |  |  |  |  | 5,000,000 |  |  |
Home Point Capital Inc |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred |  |  |  |  | $ 658,000,000 |  |  |  |  |  |
Acquisition costs |  |  |  |  |  |  |  | 7,000,000 |  |  |
Business Combination, Consideration Transferred for MSRs |  |  |  |  | 335,000,000 |  |  |  |  |  |
Business Combination, Consideration Transferred for Tender Offer |  |  |  |  | 323,000,000 |  |  |  |  |  |
Price per share (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 2.33
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Senior Note |  |  |  |  |  |  |  |  |  |  | $ 500,000,000
Mortgage servicing rights acquired |  |  |  |  |  |  |  |  |  |  | $ 1,200,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other liabilities |  |  | $ 4,000,000 |  |  |  |  |  |  |  |
Business Combination, Bargain Purchase, Gain Recognized, Description |  |  |  | The Company believes it was able to negotiate a bargain purchase price due to seller’s operational challenges from significant market volatility, as well as the seller’s desire to exit the business in an expedited manner. |  |  |  |  |  |  |
Home Point Capital Inc | Corporate/Other(2) |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business Combination, Bargain Purchase, Gain Recognized, Final Amount |  |  | 92,000,000 |  |  |  |  |  |  |  |
Business Combination, Bargain Purchase, Gain Recognized, Amount |  |  | $ 4,000,000 |  |  |  |  | 96,000,000 |  |  |
Roosevelt [Member] |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Business Combination, Consideration Transferred | $ 28,000,000 |  |  |  |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | $ 4,000,000 |  |  |  |  |  |  |  |  |  |
Goodwill, Acquired During Period |  |  |  |  | $ 21,000,000 |  |  |  |  |  |
Acquisition costs |  |  |  |  |  |  |  | 13,000,000 |  |  |
Roosevelt [Member] | Corporate/Other(2) |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill, Acquired During Period |  |  |  |  |  |  |  | 16,000,000 |  |  |
Roosevelt [Member] | Servicing |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |
Goodwill, Acquired During Period |  |  |  |  |  |  |  | $ 5,000,000 |  |  |

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- Definition Amount of consideration transferred in asset acquisition. Includes, but is not limited to, cash, liability incurred by acquirer, and equity interest issued by acquirer. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 805 -SubTopic 50 -Name Accounting Standards Codification -Section 55 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479908/805-50-55-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 50 -Name Accounting Standards Codification -Section 25 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480060/805-50-25-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 50 -Name Accounting Standards Codification -Section 30 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480027/805-50-30-1 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 805 -SubTopic 50 -Name Accounting Standards Codification -Section 30 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480027/805-50-30-2 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 805 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479907/805-20-50-5 + Details
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- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479405/805-10-25-23 + Details
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- Definition In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of gain recognized by the entity. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479637/805-30-30-6 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479637/805-30-30-5 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479668/805-30-25-2 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479668/805-30-25-3 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479668/805-30-25-4 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (f)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479581/805-30-50-1 + Details
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- Definition In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents a description of the reasons why the transaction resulted in a gain. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479637/805-30-30-6 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 5 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479637/805-30-30-5 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479668/805-30-25-2 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (f)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479581/805-30-50-1 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479668/805-30-25-3 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 25 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479668/805-30-25-4 + Details
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- Definition Indicates line item in statement of income or comprehensive income that includes gain from bargain purchase in business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 805 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (f)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479581/805-30-50-1 + Details
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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 30 -Paragraph 8 -SubTopic 30 -Topic 805 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479637/805-30-30-8 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b) -SubTopic 30 -Topic 805 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479581/805-30-50-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 30 -Paragraph 7 -SubTopic 30 -Topic 805 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479637/805-30-30-7 + Details
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