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Mortgage Servicing Rights and Related Liabilities - Fair Value Sensitivity Analysis (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
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Mortgage servicing rights |  |
Excess Spread Financing - Hypothetical Sensitivities |  |
Total prepayment speeds, 10% Adverse Change | $ (134) | $ (148)
Total prepayment speeds, 20% Adverse Change | (259) | (286)
Cost to Service per Loan, 10% Adverse Change | (56) | (46)
Cost to Service per Loan, 20% Adverse Change | (113) | (93)
Excess spread financing |  |
Excess Spread Financing - Hypothetical Sensitivities |  |
Total prepayment speeds, 10% Adverse Change | 23 | 28
Total prepayment speeds, 20% Adverse Change | 47 | 58
100 bps Adverse Change | Mortgage servicing rights |  |
Excess Spread Financing - Hypothetical Sensitivities |  |
Discount Rate | (207) | (141)
100 bps Adverse Change | Excess spread financing |  |
Excess Spread Financing - Hypothetical Sensitivities |  |
Discount Rate | 31 | 26
200 bps Adverse Change | Mortgage servicing rights |  |
Excess Spread Financing - Hypothetical Sensitivities |  |
Discount Rate | (399) | (272)
200 bps Adverse Change | Excess spread financing |  |
Excess Spread Financing - Hypothetical Sensitivities |  |
Discount Rate | $ 64 | $ 54

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719 + Details
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