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Equity - Dividend Restrictions, Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2021
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 $ 350  
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments with Regulatory Approval 295  
P&C Subsidiaries    
Class of Stock [Line Items]    
Proceeds from Dividends Received 900  
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments with Regulatory Approval 1,700  
Mutual Fund [Member]    
Class of Stock [Line Items]    
Proceeds from Dividends Received 127  
Harford Holdings, Inc. [Member]    
Class of Stock [Line Items]    
Proceeds from Dividends Received 78  
P&C Runoff Subsidiaries    
Class of Stock [Line Items]    
Proceeds from Dividends Received $ 50  
Minimum | HLA | Scenario, Forecast    
Class of Stock [Line Items]    
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments with Regulatory Approval   $ 250
Minimum | P&C Subsidiaries | Scenario, Forecast    
Class of Stock [Line Items]    
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments with Regulatory Approval   850
Maximum | HLA | Scenario, Forecast    
Class of Stock [Line Items]    
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments with Regulatory Approval   295
Maximum | P&C Subsidiaries | Scenario, Forecast    
Class of Stock [Line Items]    
Statutory Accounting Practices, Statutory Amount Available for Dividend Payments with Regulatory Approval   $ 900