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Statutory Information - Narrative (Details)
$ in Millions
3 Months Ended
Sep. 30, 2023
USD ($)
Jun. 30, 2023
USD ($)
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Statutory Accounting Practices [Line Items]        
Risk to capital ratio, regulatory maximum 25      
Consolidated insurance subsidiaries        
Statutory Accounting Practices [Line Items]        
Restricted net assets held by consolidated subsidiaries $ 4,400      
Radian Guaranty        
Statutory Accounting Practices [Line Items]        
Risk to capital ratio 10.6     10.7
Statutory positive unassigned surplus $ 174     $ 258
Payments of ordinary dividends 100 $ 100 $ 100  
Radian Guaranty | Eagle Re 2019-1 Ltd. and Eagle Re 2020-1 Ltd.        
Statutory Accounting Practices [Line Items]        
Contingency reserves $ 39