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Reinsurance - Single Premium QSR Program (Details) - Radian Guaranty - USD ($) $ in Millions | Sep. 30, 2022 | Jul. 01, 2022 | Jan. 01, 2020 | Jan. 01, 2018 | Jan. 01, 2016 | Dec. 31, 2022 | Dec. 31, 2021
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2022 QSR Agreement |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |
Ceding commission % |  | 20.00% |  |  |  |  |
RIF ceded |  |  |  |  |  | $ 3,307 | $ 0
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 |  |  |  |  |  | 1,993 | 2,198
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 |  |  |  |  |  | 876 | 1,117
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 |  |  |  |  |  | $ 1,207 | $ 1,913
2016 Single Premium QSR Agreement | Minimum | Product Concentration Risk | Revenue Benchmark |  |  |  |  |  |  |
Ceded Credit Risk [Line Items] |  |  |  |  |  |  |
Quota share % | 18.00% |  |  |  | 20.00% |  |
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% |  |  |  | 65.00% |  |

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