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Reinsurance - QSR Program (Details) - Radian Guaranty - USD ($)
$ in Millions
 1 Months Ended 9 Months Ended
Jul. 31, 2025
Sep. 30, 2025
Dec. 31, 2024
2027 QSR Agreement      
Ceded Credit Risk [Line Items]      
NIW policy dates July 1, 2027, to June 30, 2028    
2027 QSR Agreement | Revenue Benchmark | Product Concentration Risk      
Ceded Credit Risk [Line Items]      
Quota share % 15.00%    
2026 QSR Agreement      
Ceded Credit Risk [Line Items]      
NIW policy dates July 1, 2026, to June 30, 2027    
2026 QSR Agreement | Revenue Benchmark | Product Concentration Risk      
Ceded Credit Risk [Line Items]      
Quota share % 30.00%    
2025 QSR Agreement      
Ceded Credit Risk [Line Items]      
NIW policy dates [1],[2],[3]   Jul 1, 2025-Jun 30, 2026  
Optional termination date [1],[2]   Jul. 01, 2029  
Ceding commission % [1]   20.00%  
RIF ceded   $ 1,217 $ 0
2025 QSR Agreement | Revenue Benchmark | Product Concentration Risk      
Ceded Credit Risk [Line Items]      
Quota share % [1]   30.00%  
2024 QSR Agreement      
Ceded Credit Risk [Line Items]      
NIW policy dates [1],[2],[3]   Jul 1, 2024-Jun 30, 2025  
Optional termination date [1],[2]   Jul. 01, 2028  
Ceding commission % [1]   20.00%  
RIF ceded   $ 2,953 1,621
2024 QSR Agreement | Revenue Benchmark | Product Concentration Risk      
Ceded Credit Risk [Line Items]      
Quota share % [1]   25.00%  
2023 QSR Agreement      
Ceded Credit Risk [Line Items]      
NIW policy dates [1],[2],[3]   Jul 1, 2023-Jun 30, 2024  
Optional termination date [1],[2]   Jul. 01, 2027  
Ceding commission % [1]   20.00%  
RIF ceded   $ 2,280 2,518
2023 QSR Agreement | Revenue Benchmark | Product Concentration Risk      
Ceded Credit Risk [Line Items]      
Quota share % [1]   22.50%  
2022 QSR Agreement      
Ceded Credit Risk [Line Items]      
NIW policy dates [1],[2],[3]   Jan 1, 2022-Jun 30, 2023  
Effective date   Jul. 01, 2022  
Optional termination date [1],[2]   Jul. 01, 2026  
Ceding commission % [1]   20.00%  
RIF ceded   $ 3,703 4,059
2022 QSR Agreement | Revenue Benchmark | Product Concentration Risk      
Ceded Credit Risk [Line Items]      
Quota share % [1]   20.00%  
2020 Single Premium QSR Agreement      
Ceded Credit Risk [Line Items]      
NIW policy dates [1],[2],[3]   Jan 1, 2020-Dec 31, 2021  
Optional termination date [1],[2]   Jan. 01, 2024  
Ceding commission % [1]   25.00%  
RIF ceded   $ 1,380 1,525
2020 Single Premium QSR Agreement | Revenue Benchmark | Product Concentration Risk      
Ceded Credit Risk [Line Items]      
Quota share % [1]   65.00%  
2018 Single Premium QSR Agreement      
Ceded Credit Risk [Line Items]      
NIW policy dates [1],[2],[3]   Jan 1, 2018-Dec 31, 2019  
Optional termination date [1],[2]   Jan. 01, 2022  
Ceding commission % [1]   25.00%  
RIF ceded   $ 608 661
2018 Single Premium QSR Agreement | Revenue Benchmark | Product Concentration Risk      
Ceded Credit Risk [Line Items]      
Quota share % [1]   65.00%  
2016 Single Premium QSR Agreement      
Ceded Credit Risk [Line Items]      
NIW policy dates [1],[2],[3]   Jan 1, 2012-Dec 31, 2017  
Effective date   Jan. 01, 2016  
Optional termination date [1],[2]   Jan. 01, 2020  
Ceding commission % [1]   25.00%  
RIF ceded   $ 802 $ 873
Minimum | 2016 Single Premium QSR Agreement | Revenue Benchmark | Product Concentration Risk      
Ceded Credit Risk [Line Items]      
Quota share % [1]   18.00%  
Maximum | 2025 QSR Agreement      
Ceded Credit Risk [Line Items]      
Profit commission % [1]   63.00%  
Maximum | 2024 QSR Agreement      
Ceded Credit Risk [Line Items]      
Profit commission % [1]   59.00%  
Maximum | 2023 QSR Agreement      
Ceded Credit Risk [Line Items]      
Profit commission % [1]   55.00%  
Maximum | 2022 QSR Agreement      
Ceded Credit Risk [Line Items]      
Profit commission % [1]   59.00%  
Maximum | 2020 Single Premium QSR Agreement      
Ceded Credit Risk [Line Items]      
Profit commission % [1]   56.00%  
Maximum | 2018 Single Premium QSR Agreement      
Ceded Credit Risk [Line Items]      
Profit commission % [1]   56.00%  
Maximum | 2016 Single Premium QSR Agreement      
Ceded Credit Risk [Line Items]      
Profit commission % [1]   55.00%  
Maximum | 2016 Single Premium QSR Agreement | Revenue Benchmark | Product Concentration Risk      
Ceded Credit Risk [Line Items]      
Quota share % [1]   57.00%  
[1] Excludes the 2012 QSR Agreements, for which RIF ceded is no longer material, and the 2026 and 2027 QSR Agreements that were entered into in July 2025, but are effective for future NIW vintages from July 1, 2026, to June 30, 2027, and July 1, 2027, to June 30, 2028, respectively, with cessions of 30% and 15%, respectively.
[2] Radian Guaranty has the option, based on certain conditions and subject to a termination fee, to terminate any of the agreements at the end of any calendar quarter on or after the applicable optional termination date. If Radian Guaranty exercises this option in the future, it would result in Radian Guaranty reassuming the related RIF in exchange for a net payment to the reinsurers calculated in accordance with the terms of the applicable agreement. Radian Guaranty also may terminate any of the agreements prior to the scheduled termination date under certain circumstances, including if one or both of the GSEs no longer grant full PMIERs credit for the reinsurance. The scheduled termination date is 10 years after the ending NIW policy date.
[3] The effective date for each agreement is the same as the beginning NIW policy date, except for the following: the 2016 Single Premium QSR Agreement, which has an effective date of January 1, 2016, and the 2022 QSR Agreement, which has an effective date of July 1, 2022.