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Equity - Dividend Restrictions, Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2022
Class of Stock [Line Items]    
Percent of insurer's policyholder surplus available for dividends 10.00%  
Statutory Dividend Payment Restrictions Disclosure There are no current restrictions on HFSG Holding Company's ability to pay dividends to its stockholders.  
HLA    
Class of Stock [Line Items]    
Proceeds from Dividends Received $ 295  
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments with Regulatory Approval 241  
P&C Subsidiaries    
Class of Stock [Line Items]    
Proceeds from Dividends Received 1,100  
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments with Regulatory Approval 2,000  
Mutual Fund [Member]    
Class of Stock [Line Items]    
Proceeds from Dividends Received 165  
Harford Holdings, Inc. [Member]    
Class of Stock [Line Items]    
Proceeds from Dividends Received 50  
P&C Runoff Subsidiaries    
Class of Stock [Line Items]    
Proceeds from Dividends Received $ 150  
Minimum | HLA | Scenario, Forecast    
Class of Stock [Line Items]    
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments with Regulatory Approval   $ 175
Minimum | P&C Subsidiaries | Scenario, Forecast    
Class of Stock [Line Items]    
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments with Regulatory Approval   1,300
Maximum | HLA | Scenario, Forecast    
Class of Stock [Line Items]    
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments with Regulatory Approval   200
Maximum | P&C Subsidiaries | Scenario, Forecast    
Class of Stock [Line Items]    
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments with Regulatory Approval   $ 1,400