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Reinsurance - QSR Program (Details) - Radian Guaranty - USD ($) $ in Millions | Jul. 01, 2023 | Sep. 30, 2022 | Jul. 01, 2022 | Jan. 01, 2020 | Jan. 01, 2018 | Jan. 01, 2016 | Sep. 30, 2023 | Dec. 31, 2022
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2023 QSR Agreement |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |
Ceding commission % | 20.00% |  |  |  |  |  |  |
RIF ceded |  |  |  |  |  |  | $ 784 | $ 0
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 |  |  |  |  |  |  | 4,524 | 3,307
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 |  |  |  |  |  |  | 1,830 | 1,993
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 |  |  |  |  |  |  | 763 | 876
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 |  |  |  |  |  |  | $ 1,012 | $ 1,207
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% |  |  |  |  |  |
Minimum | 2016 Single Premium QSR Agreement | Revenue Benchmark | Product Concentration Risk |  |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |  |
Quota share % |  | 18.00% |  |  |  |  |  |

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