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Reinsurance - Single Premium QSR Program (Details) - Radian Guaranty - USD ($) $ in Millions | Jul. 01, 2024 | Jul. 01, 2023 | Jul. 01, 2022 | Jan. 01, 2020 | Jan. 01, 2018 | Jan. 01, 2016 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | --- | --- | ---
2024 QSR Agreement |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |
Ceding commission % | 20.00% |  |  |  |  |  |  |
RIF ceded |  |  |  |  |  |  | $ 1,621 | $ 0
NIW policy dates | Jul 1, 2024-Jun 30, 2025 |  |  |  |  |  |  |
Effective date | Jul. 01, 2024 |  |  |  |  |  |  |
Scheduled termination date | Jun. 30, 2035 |  |  |  |  |  |  |
Optional termination date | Jul. 01, 2028 |  |  |  |  |  |  |
2024 QSR Agreement | Product Concentration Risk | Revenue Benchmark |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |
Quota share % | 25.00% |  |  |  |  |  |  |
2024 QSR Agreement | Maximum |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |
Profit commission % | 59.00% |  |  |  |  |  |  |
2023 QSR Agreement |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |
Ceding commission % |  | 20.00% |  |  |  |  |  |
RIF ceded |  |  |  |  |  |  | 2,518 | 1,366
NIW policy dates |  | Jul 1, 2023-Jun 30, 2024 |  |  |  |  |  |
Effective date |  | Jul. 01, 2023 |  |  |  |  |  |
Scheduled termination date |  | Jun. 30, 2034 |  |  |  |  |  |
Optional termination date |  | Jul. 01, 2027 |  |  |  |  |  |
2023 QSR Agreement | Product Concentration Risk | Revenue Benchmark |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |
Quota share % |  | 22.50% |  |  |  |  |  |
2023 QSR Agreement | Maximum |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |
Profit commission % |  | 55.00% |  |  |  |  |  |
2022 QSR Agreement |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |
Ceding commission % |  |  | 20.00% |  |  |  |  |
RIF ceded |  |  |  |  |  |  | 4,059 | 4,454
NIW policy dates |  |  | Jan 1, 2022-Jun 30, 2023 |  |  |  |  |
Effective date |  |  | Jul. 01, 2022 |  |  |  |  |
Scheduled termination date |  |  | Jun. 30, 2033 |  |  |  |  |
Optional termination date |  |  | Jul. 01, 2026 |  |  |  |  |
2022 QSR Agreement | Product Concentration Risk | Revenue Benchmark |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |
Quota share % |  |  | 20.00% |  |  |  |  |
2022 QSR Agreement | Maximum |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |
Profit commission % |  |  | 59.00% |  |  |  |  |
2020 Single Premium QSR Agreement |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |
Ceding commission % |  |  |  | 25.00% |  |  |  |
RIF ceded |  |  |  |  |  |  | 1,525 | 1,783
NIW policy dates |  |  |  | Jan 1, 2020-Dec 31, 2021 |  |  |  |
Effective date |  |  |  | Jan. 01, 2020 |  |  |  |
Scheduled termination date |  |  |  | Dec. 31, 2031 |  |  |  |
Optional termination date |  |  |  | Jan. 01, 2024 |  |  |  |
2020 Single Premium QSR Agreement | Product Concentration Risk | Revenue Benchmark |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |
Quota share % |  |  |  | 65.00% |  |  |  |
2020 Single Premium QSR Agreement | Maximum |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |
Profit commission % |  |  |  | 56.00% |  |  |  |
2018 Single Premium QSR Agreement |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |
Ceding commission % |  |  |  |  | 25.00% |  |  |
RIF ceded |  |  |  |  |  |  | 661 | 739
NIW policy dates |  |  |  |  | Jan 1, 2018-Dec 31, 2019 |  |  |
Effective date |  |  |  |  | Jan. 01, 2018 |  |  |
Scheduled termination date |  |  |  |  | Dec. 31, 2029 |  |  |
Optional termination date |  |  |  |  | Jan. 01, 2022 |  |  |
2018 Single Premium QSR Agreement | Product Concentration Risk | Revenue Benchmark |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |
Quota share % |  |  |  |  | 65.00% |  |  |
2018 Single Premium QSR Agreement | Maximum |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |
Profit commission % |  |  |  |  | 56.00% |  |  |
2016 Single Premium QSR Agreement |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |
Ceding commission % |  |  |  |  |  | 25.00% |  |
RIF ceded |  |  |  |  |  |  | $ 873 | $ 982
NIW policy dates |  |  |  |  |  | Jan 1, 2012-Dec 31, 2017 |  |
Effective date |  |  |  |  |  | Jan. 01, 2016 |  |
Scheduled termination date |  |  |  |  |  | Dec. 31, 2027 |  |
Optional termination date |  |  |  |  |  | Jan. 01, 2020 |  |
2016 Single Premium QSR Agreement | Minimum | Product Concentration Risk | Revenue Benchmark |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |
Quota share % |  |  |  |  |  | 18.00% |  |
2016 Single Premium QSR Agreement | Maximum |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |
Profit commission % |  |  |  |  |  | 55.00% |  |
2016 Single Premium QSR Agreement | Maximum | Product Concentration Risk | Revenue Benchmark |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |
Quota share % |  |  |  |  |  | 57.00% |  |

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