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Regulation and Equity - Narrative (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2024
Statutory Accounting Practices [Line Items]        
Change in statutory capital surplus $ 34 $ 32    
Combined statutory unearned premium reserve required 1,659      
Net assets restricted from dividend payments without prior approval 1,145      
Statutory capital and surplus 1,225 1,350    
Statutory net income 503 778 $ 936  
Minimum net worth required for compliance 1      
Dividends paid with approval of Iowa Commissioner     $ 38  
Corbeau Re        
Statutory Accounting Practices [Line Items]        
Change in statutory capital surplus 765      
Non-permitted statutory accounting practices deficit (594)      
Statutory capital and surplus 171      
IOWA        
Statutory Accounting Practices [Line Items]        
Change in statutory capital surplus 16 13    
Increase (decrease) in statutory capital surplus 178 (152)    
Statutory capital and surplus 2,009 1,877    
VERMONT | Corbeau Re        
Statutory Accounting Practices [Line Items]        
Statutory capital and surplus   0    
VERMONT | Raven Re        
Statutory Accounting Practices [Line Items]        
Statutory capital and surplus 140 121    
VERMONT | Raven Re        
Statutory Accounting Practices [Line Items]        
Change in statutory capital surplus   200    
Statutory capital and surplus 140 121    
Non-permitted statutory accounting practices deficit (89) (107)    
New York        
Statutory Accounting Practices [Line Items]        
Statutory capital and surplus $ 86 $ 82    
Forecast        
Statutory Accounting Practices [Line Items]        
Statutory amount available for distributions without prior approval       $ 471