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Mortgage Servicing Rights and Related Liabilities - Fair Value Sensitivity Analysis (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
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Mortgage servicing rights |  |
Excess Spread Financing - Hypothetical Sensitivities |  |
10% Adverse Change | $ (157) | $ (165)
20% Adverse Change | (321) | (317)
Excess spread financing |  |
Excess Spread Financing - Hypothetical Sensitivities |  |
10% Adverse Change | 44 | 46
20% Adverse Change | 92 | 96
100 bps Adverse Change | Mortgage servicing rights |  |
Excess Spread Financing - Hypothetical Sensitivities |  |
Discount Rate | (87) | (127)
100 bps Adverse Change | Excess spread financing |  |
Excess Spread Financing - Hypothetical Sensitivities |  |
Discount Rate | 35 | 46
200 bps Adverse Change | Mortgage servicing rights |  |
Excess Spread Financing - Hypothetical Sensitivities |  |
Discount Rate | (179) | (245)
200 bps Adverse Change | Excess spread financing |  |
Excess Spread Financing - Hypothetical Sensitivities |  |
Discount Rate | $ 72 | $ 95

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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 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 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 No definition available. + 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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