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Reinsurance - Excess-of-Loss Program (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2023 | Nov. 30, 2021 | Apr. 30, 2021 | Mar. 31, 2024 | Dec. 31, 2023
Mortgage Insurance revenues |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |
Direct primary mortgage insurance risk in force |  |  |  | $ 70,300 | $ 69,700
Eagle Re 2023-1 Ltd. | Excess-of-Loss Program | Mortgage Insurance revenues | Radian Guaranty |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |
RIF | $ 8,782 |  |  | 8,525 | 8,659
Coverage | 353 |  |  | 353 | 353
Eagle Re 2023-1 Ltd. | Excess-of-Loss Program | Mortgage Insurance revenues | Radian Guaranty | First layer retention |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |
First layer retention | 287 |  |  | 287 | 287
Eagle Re 2021-2 Ltd. | Excess-of-Loss Program | Mortgage Insurance revenues | Radian Guaranty |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |
RIF |  | $ 10,758 |  | 7,309 | 7,651
Coverage |  | 484 |  | 328 | 355
Eagle Re 2021-2 Ltd. | Excess-of-Loss Program | Mortgage Insurance revenues | Radian Guaranty | First layer retention |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |
First layer retention |  | $ 242 |  | 242 | 242
Eagle Re 2021-1 Ltd. | Excess-of-Loss Program | Radian Guaranty | Radian Group Inc. |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |
Proceeds from issuance of debt |  |  |  | 45 |
Eagle Re 2021-1 Ltd. | Excess-of-Loss Program | Mortgage Insurance revenues | Radian Guaranty |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |
RIF |  |  | $ 11,061 | 5,922 | 6,227
Coverage |  |  | 498 | 227 | 250
Eagle Re 2021-1 Ltd. | Excess-of-Loss Program | Mortgage Insurance revenues | Radian Guaranty | First layer retention |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |
First layer retention |  |  | $ 221 | 221 | 221
2023 XOL Agreement | Excess-of-Loss Program | Mortgage Insurance revenues | Radian Guaranty |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |
Coverage | 246 |  |  | 204 | 226
Direct primary mortgage insurance risk in force | 8,002 |  |  | 7,581 | 7,814
2023 XOL Agreement | Excess-of-Loss Program | Mortgage Insurance revenues | Radian Guaranty | First layer retention |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |
First layer retention | $ 240 |  |  | $ 240 | $ 240

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- Definition Statutory Accounting Practices, Risk In Force + References No definition available. + 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 944 -SubTopic 825 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479383/944-825-50-1B + Details
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- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 14 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482740/230-10-45-14 + Details
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- Definition Amount per life of risk undertaken originally by insurer that is not ceded to reinsurer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479838/944-20-50-3 + Details
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- Definition Amount per life of risk ceded to reinsurer in excess of risk undertaken originally by insurer that is not ceded to reinsurer. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479838/944-20-50-3 + Details
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