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Reinsurance - QSR Program (Details) - Radian Guaranty - USD ($) $ in Millions | Jul. 01, 2023 | Jul. 01, 2022 | Jan. 01, 2020 | Jan. 01, 2018 | Jan. 01, 2016 | Jun. 30, 2024 | Dec. 31, 2023
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2023 QSR Agreement |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |
Ceding commission % | 20.00% |  |  |  |  |  |
RIF ceded |  |  |  |  |  | $ 2,719 | $ 1,366
2023 QSR Agreement | Revenue Benchmark | Product Concentration Risk |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |
Quota share % | 22.50% |  |  |  |  |  |
2022 QSR Agreement |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |
Ceding commission % |  | 20.00% |  |  |  |  |
RIF ceded |  |  |  |  |  | 4,278 | 4,454
2022 QSR Agreement | Revenue Benchmark | Product Concentration Risk |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |
Quota share % |  | 20.00% |  |  |  |  |
2020 Single Premium QSR Agreement |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |
Ceding commission % |  |  | 25.00% |  |  |  |
RIF ceded |  |  |  |  |  | 1,657 | 1,783
2020 Single Premium QSR Agreement | Revenue Benchmark | Product Concentration Risk |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |
Quota share % |  |  | 65.00% |  |  |  |
2018 Single Premium QSR Agreement |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |
Ceding commission % |  |  |  | 25.00% |  |  |
RIF ceded |  |  |  |  |  | 697 | 739
2018 Single Premium QSR Agreement | Revenue Benchmark | Product Concentration Risk |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |
Quota share % |  |  |  | 65.00% |  |  |
2016 Single Premium QSR Agreement |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |
Ceding commission % |  |  |  |  | 25.00% |  |
RIF ceded |  |  |  |  |  | $ 927 | $ 982
Minimum | 2016 Single Premium QSR Agreement | Revenue Benchmark | Product Concentration Risk |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |
Quota share % |  |  |  |  | 18.00% |  |
Maximum | 2023 QSR Agreement |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |
Profit commission % | 55.00% |  |  |  |  |  |
Maximum | 2022 QSR Agreement |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |
Profit commission % |  | 59.00% |  |  |  |  |
Maximum | 2020 Single Premium QSR Agreement |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |
Profit commission % |  |  | 56.00% |  |  |  |
Maximum | 2018 Single Premium QSR Agreement |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |
Profit commission % |  |  |  | 56.00% |  |  |
Maximum | 2016 Single Premium QSR Agreement |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |
Profit commission % |  |  |  |  | 55.00% |  |
Maximum | 2016 Single Premium QSR Agreement | Revenue Benchmark | Product Concentration Risk |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |
Quota share % |  |  |  |  | 57.00% |  |

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