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Reinsurance - Narrative (Details) $ in Millions |  | 6 Months Ended |
--- | --- | --- | ---
Jul. 01, 2023 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2023 USD ($)
Radian Guaranty |  |  |
Ceded Credit Risk [Line Items] |  |  |
Funds held under reinsurance agreements, asset |  | $ 283 | $ 274
Mortgage Insurance revenues |  |  |
Ceded Credit Risk [Line Items] |  |  |
Direct primary mortgage insurance risk in force |  | $ 71,100 | $ 69,700
2023 QSR Agreement | Radian Guaranty |  |  |
Ceded Credit Risk [Line Items] |  |  |
Ceding commission % | 20.00% |  |
2024 QSR Agreement |  |  |
Ceded Credit Risk [Line Items] |  |  |
Percentage of policies ceded to reinsurer (in percent) |  | 0.25 |
Risk In Force |  | $ 4,300 |
2024 QSR Agreement | Radian Guaranty |  |  |
Ceded Credit Risk [Line Items] |  |  |
Ceding commission % |  | 20.00% |
Excess-of-Loss Program | Radian Guaranty |  |  |
Ceded Credit Risk [Line Items] |  |  |
Percent of reinsurance coverage threshold (in percent) |  | 0.10 |
Maximum | Mortgage Insurance revenues | Radian Guaranty |  |  |
Ceded Credit Risk [Line Items] |  |  |
Reinsurance retention policy, term of coverage, period |  | 12 years 6 months |
Maximum | 2023 QSR Agreement |  |  |
Ceded Credit Risk [Line Items] |  |  |
Direct primary mortgage insurance risk in force | $ 3,000 |  |
Maximum | 2023 QSR Agreement | Radian Guaranty |  |  |
Ceded Credit Risk [Line Items] |  |  |
Profit commission % | 55.00% |  |
Maximum | 2024 QSR Agreement | Radian Guaranty |  |  |
Ceded Credit Risk [Line Items] |  |  |
Profit commission % |  | 59.00% |
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 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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