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Reinsurance - Excess-of-Loss Program (Details) - USD ($) $ in Millions | 1 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Oct. 31, 2023 | Nov. 30, 2021 | Apr. 30, 2021 | Sep. 30, 2025 | Dec. 31, 2024
Mortgage Insurance revenues |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |
Direct primary mortgage insurance risk in force |  |  |  | $ 74,000 | $ 72,100
Eagle Re 2023-1 Ltd. | Excess-of-Loss Program | Mortgage Insurance revenues | Radian Guaranty |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |
RIF | $ 8,782 |  |  | 7,236 | 7,906
Coverage | 353 |  |  | 278 | 327
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 |  |  | 283 | 286
Eagle Re 2021-2 Ltd. | Excess-of-Loss Program | Mortgage Insurance revenues | Radian Guaranty |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |
RIF |  | $ 10,758 |  | 5,359 | 6,271
Coverage |  | 484 |  | 176 | 247
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 |  | 240 | 241
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 | 4,198 | 4,966
Coverage |  |  | 498 | 97 | 155
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 | 220 | 221
2023 XOL Agreement | Excess-of-Loss Program | Mortgage Insurance revenues | Radian Guaranty |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |
Coverage | 246 |  |  | 134 | 167
Direct primary mortgage insurance risk in force | 8,002 |  |  | 6,090 | 6,815
2023 XOL Agreement | Excess-of-Loss Program | Mortgage Insurance revenues | Radian Guaranty | First layer retention |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |
First layer retention | $ 240 |  |  | $ 239 | $ 240

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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 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477351/944-825-50-1B Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 825 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477351/944-825-50-1B + 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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