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Regulation and Equity - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2023
Statutory Accounting Practices [Line Items]        
Change in statutory capital surplus $ 32,000,000 $ 29,000,000    
Combined statutory unearned premium reserve required 1,772,000,000      
Net assets restricted from dividend payments without prior approval 1,442,000,000      
Statutory capital and surplus 1,350,000,000 1,903,000,000    
Statutory net income 778,000,000 936,000,000 $ 629,000,000  
Minimum net worth required for compliance 1,000,000      
Dividends paid with approval of Iowa Commissioner 0 38,000,000    
Forecast        
Statutory Accounting Practices [Line Items]        
Statutory amount available for distributions without prior approval       $ 606,000,000
IOWA        
Statutory Accounting Practices [Line Items]        
Statutory capital and surplus 1,877,000,000 1,473,000,000    
Statutory net income (243,000,000) 351,000,000    
Increase (decrease) in statutory capital surplus (152,000,000) (106,000,000)    
IOWA | Raven Re        
Statutory Accounting Practices [Line Items]        
Change in statutory capital surplus 200,000,000 85,000,000    
VERMONT        
Statutory Accounting Practices [Line Items]        
Statutory capital and surplus 121,000,000 115,000,000    
Statutory net income (111,000,000) 3,000,000    
VERMONT | Raven Re        
Statutory Accounting Practices [Line Items]        
Change in statutory capital surplus 28,000,000 0    
Statutory capital and surplus 121,000,000 115,000,000    
Non-permitted statutory accounting practices (107,000,000) 30,000,000    
New York        
Statutory Accounting Practices [Line Items]        
Statutory capital and surplus 82,000,000 99,000,000    
Statutory net income $ (15,000,000) $ 4,000,000