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Mortgage Servicing Rights and Related Liabilities - Fair Value Sensitivity Analysis (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Mortgage servicing rights |  |
Excess Spread Financing - Hypothetical Sensitivities |  |
Total prepayment speeds, 10% Adverse Change | $ (321) | $ (308)
Total prepayment speeds, 20% Adverse Change | (620) | (597)
Cost to Service per Loan, 10% Adverse Change | (78) | (84)
Cost to Service per Loan, 20% Adverse Change | (157) | (169)
Mortgage servicing rights | 100 bps Adverse Change |  |
Excess Spread Financing - Hypothetical Sensitivities |  |
Option Adjusted Spread | (456) | (470)
Mortgage servicing rights | 200 bps Adverse Change |  |
Excess Spread Financing - Hypothetical Sensitivities |  |
Option Adjusted Spread | (876) | (904)
Excess spread financing |  |
Excess Spread Financing - Hypothetical Sensitivities |  |
Total prepayment speeds, 10% Adverse Change | 8 | 8
Total prepayment speeds, 20% Adverse Change | 17 | 17
Excess spread financing | 100 bps Adverse Change |  |
Excess Spread Financing - Hypothetical Sensitivities |  |
Option Adjusted Spread | 12 | 13
Excess spread financing | 200 bps Adverse Change |  |
Excess Spread Financing - Hypothetical Sensitivities |  |
Option Adjusted Spread | $ 25 | $ 28

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- Definition The hypothetical financial impact of a 10 percent adverse change of the specified assumption on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 860 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481326/860-20-50-4 + Details
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- Definition The hypothetical financial impact of a 10 percent adverse change of prepayment speed on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 860 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481326/860-20-50-4 + Details
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- Definition The hypothetical financial impact of a 20 percent adverse change of the specified assumption on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 860 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481326/860-20-50-4 + Details
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- Definition The hypothetical financial impact of a 20 percent adverse change of prepayment speed on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 860 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481326/860-20-50-4 + Details
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- Definition The hypothetical financial impact of a specified adverse percentage change in discount rate on the fair value of transferor's interests in transferred financial assets (including any servicing assets or servicing liabilities) as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 860 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481326/860-20-50-4 + Details
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