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Equity - Dividend Restrictions, Additional Information (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2019
Class of Stock [Line Items]      
Percent of insurer's policyholder surplus available for dividends   10.00%  
Dividends received   $ 3,100,000,000  
Extraordinary dividends received   3,000,000,000.0  
Dividends received, subsequently used to pay debt   1,900,000,000  
Dividends received, subsequently contributed to subsidiary   50,000,000  
Dividends received, net   $ 2,900,000,000  
Statutory Dividend Payment Restrictions Disclosure   There are no current restrictions on the HFSG Holding Company's ability to pay dividends to its stockholders.  
Interest Expense [Member]      
Class of Stock [Line Items]      
Dividends received, subsequently used to pay debt   $ 226,000,000  
P&C Subsidiaries      
Class of Stock [Line Items]      
Dividends received, net   2,800,000,000  
P&C Subsidiaries | Scenario, Forecast      
Class of Stock [Line Items]      
Dividends received, net $ 0    
Maximum dividends permitted to be paid 1,200,000,000   $ 200,000,000
HLA      
Class of Stock [Line Items]      
Dividends received, net   0  
HLA | Scenario, Forecast      
Class of Stock [Line Items]      
Maximum dividends permitted to be paid 380,000,000    
Mutual Funds      
Class of Stock [Line Items]      
Dividends received, net   119,000,000  
Minimum [Member] | P&C Subsidiaries | Scenario, Plan [Member]      
Class of Stock [Line Items]      
Dividends received, net   850  
Minimum [Member] | HLA | Scenario, Forecast      
Class of Stock [Line Items]      
Dividends received, net 250,000,000    
Maximum | P&C Subsidiaries | Scenario, Plan [Member]      
Class of Stock [Line Items]      
Dividends received, net   900  
Maximum | HLA | Scenario, Forecast      
Class of Stock [Line Items]      
Dividends received, net $ 300,000,000    
Other Current Liabilities [Member]      
Class of Stock [Line Items]      
Dividends received, subsequently used to pay debt   900,000,000  
Parent Company      
Class of Stock [Line Items]      
Dividends received, subsequently contributed to subsidiary   $ 110,000,000