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Reinsurance - Additional Information (Details) $ in Millions |  |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 01, 2024 | Jul. 01, 2023 | Jun. 30, 2025 USD ($) Agreement | Jun. 30, 2025 USD ($) | Dec. 31, 2024 USD ($)
Radian Guaranty |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |
Funds held under reinsurance agreements, asset |  |  | $ 295 | $ 295 | $ 283
Number of quota share reinsurance arrangements | Agreement |  |  | 3 |  |
Mortgage Insurance revenues |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |
Direct primary mortgage insurance risk in force |  |  | $ 72,800 | $ 72,800 | $ 72,100
2023 QSR Agreement | Radian Guaranty |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |
Ceding commission % |  | 20.00% |  |  |
Scheduled termination date |  | Jun. 30, 2034 |  |  |
2024 QSR Agreement | Radian Guaranty |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |
Ceding commission % | 20.00% |  |  |  |
Scheduled termination date | Jun. 30, 2035 |  |  |  |
2025 QSR Agreement | Radian Guaranty |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |
Percentage of policies ceded to reinsurer (in percent) |  |  | 0.30 | 0.30 |
Policies issued period |  |  | 1 year |  |
Scheduled termination date |  |  | Jul. 01, 2029 |  |
2026 QSR Agreement | Radian Guaranty |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |
Percentage of policies ceded to reinsurer (in percent) |  |  | 0.30 | 0.30 |
Policies issued period |  |  | 1 year |  |
Scheduled termination date |  |  | Jul. 01, 2030 |  |
2027 QSR Agreement | Radian Guaranty |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |
Percentage of policies ceded to reinsurer (in percent) |  |  | 0.15 | 0.15 |
Policies issued period |  |  | 1 year |  |
Scheduled termination date |  |  | Jul. 01, 2031 |  |
Excess-of-Loss Program | Radian Guaranty |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |
Percent of reinsurance coverage threshold (in percent) |  |  |  | 0.10 |
New QSR Agreement | Radian Guaranty |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |
Term of agreement |  |  | 10 years |  |
Maximum | Mortgage Insurance revenues | Radian Guaranty |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |
Reinsurance retention policy, term of coverage, period |  |  |  | 12 years 6 months |
Maximum | 2024 QSR Agreement |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |
Direct primary mortgage insurance risk in force |  |  | $ 4,300 | $ 4,300 |
Maximum | Excess-of-Loss Program | Radian Guaranty |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |
Right to termination on or after option call date, period after issuance of insurance-linked notes |  |  |  | 7 years |
Minimum | Mortgage Insurance revenues | Radian Guaranty |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |
Reinsurance retention policy, term of coverage, period |  |  |  | 10 years |
Minimum | Excess-of-Loss Program | Radian Guaranty |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |
Right to termination on or after option call date, period after issuance of insurance-linked notes |  |  |  | 5 years |

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- Definition Number of quota share reinsurance arrangements. + 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/1943274/2147477351/944-825-50-1B + Details
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- Definition Amount of the reinsurer's funds held on its behalf by the ceding insurer, including funds held in trust, under reinsurance treaties or contracts with the assuming insurer as security for the payment of the obligations thereunder. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(10)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1 + Details
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