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Statutory Information - Narrative (Details)
$ in Millions
1 Months Ended
May 31, 2023
USD ($)
Mar. 31, 2023
USD ($)
Jun. 30, 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     10.8 10.7
Statutory positive unassigned surplus     $ 168 $ 258
Payments of ordinary dividends $ 100 $ 100    
Radian Guaranty | Eagle Re 2019-1 Ltd. and Eagle Re 2020-1 Ltd.        
Statutory Accounting Practices [Line Items]        
Contingency reserves     $ 39