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Business Combinations and Asset Acquisitions (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended |
--- | --- | --- | ---
Jul. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Aug. 01, 2023
Business Acquisition [Line Items] |  |  |  |
Asset Acquisition, Consideration Transferred |  |  | $ 34 |
Business Combination, Description [Abstract] |  |  |  |
Business Combination, Bargain Purchase, Gain, Statement of Income or Comprehensive Income [Extensible Enumeration] |  | Other expenses, net |  |
Home Point Capital Inc [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Consideration Transferred |  | $ 658 |  |
Business Combination, Consideration Transferred for MSRs |  | 335 |  |
Business Combination, Consideration Transferred for Tender Offer |  | $ 323 |  |
Price per share (in dollars per share) |  |  |  | $ 2.33
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Mortgage Servicing Rights |  |  |  | $ 1,200
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Senior Note |  |  |  | $ 500
Business Combination, Description [Abstract] |  |  |  |
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 [Member] | Corporate and other |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Bargain purchase gain |  | $ 96 |  |
Roosevelt |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Consideration Transferred | $ 28 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | $ 4 |  |  |
Goodwill acquired |  | 21 |  |
Roosevelt | Servicing |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill acquired |  | 5 |  |
Roosevelt | Corporate and other |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Goodwill acquired |  | $ 16 |  |

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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 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 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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