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Regulatory and Equity - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2022
Statutory Accounting Practices [Line Items]        
Change in statutory capital surplus $ 29 $ 28    
Combined statutory unearned premium reserve required 1,742      
Net assets restricted from dividend payments without prior approval 2,375      
Statutory capital and surplus 1,903 1,699    
Statutory net income 936 629 $ 583  
Minimum net worth required for compliance 1      
Dividends paid with approval of Iowa Commissioner 38 151    
Forecast        
Statutory Accounting Practices [Line Items]        
Statutory amount available for distributions without prior approval       $ 831
Raven Re        
Statutory Accounting Practices [Line Items]        
Statutory capital and surplus 62 29    
IOWA        
Statutory Accounting Practices [Line Items]        
Statutory capital and surplus 1,522 1,249    
Statutory net income 351 (46)    
Increase (decrease) in statutory capital surplus 106 144    
IOWA | Raven Re        
Statutory Accounting Practices [Line Items]        
Change in statutory capital surplus 85      
VERMONT        
Statutory Accounting Practices [Line Items]        
Statutory capital and surplus 115 84    
Statutory net income 9 12    
VERMONT | Raven Re        
Statutory Accounting Practices [Line Items]        
Change in statutory capital surplus 0 5    
Statutory capital and surplus 115 84    
Non-permitted statutory accounting practices 30 (6)    
NEW YORK        
Statutory Accounting Practices [Line Items]        
Statutory capital and surplus 99 93    
Statutory net income $ 4 $ (2)