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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
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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