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Segment Information - Non-insurance Revenue from Customers (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Segment Reporting Information [Line Items]    
Insurance Commissions and Fees $ 346 $ 333
Other Income 22 19
Non-insurance revenues with customers 366 352
Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Other Income 21 19
Operating Segments [Member] | P&C Business Insurance    
Segment Reporting Information [Line Items]    
Other Income 1 0
Operating Segments [Member] | P&C Personal Insurance    
Segment Reporting Information [Line Items]    
Other Income 20 19
Operating Segments [Member] | Employee Benefits [Member]    
Segment Reporting Information [Line Items]    
Other Income 0 0
Operating Segments [Member] | Hartford Funds [Member]    
Segment Reporting Information [Line Items]    
Other Income 0 0
Operating Segments [Member] | Installment billing fees [Member] | P&C Business Insurance    
Segment Reporting Information [Line Items]    
Insurance Commissions and Fees 11 11
Operating Segments [Member] | Installment billing fees [Member] | P&C Personal Insurance    
Segment Reporting Information [Line Items]    
Insurance Commissions and Fees 8 8
Operating Segments [Member] | Insurance servicing revenues | P&C Personal Insurance    
Segment Reporting Information [Line Items]    
Other Income 20 19
Operating Segments [Member] | Administrative services | Employee Benefits [Member]    
Segment Reporting Information [Line Items]    
Insurance Commissions and Fees 56 54
Operating Segments [Member] | Advisor, distribution and other management fees | Hartford Funds [Member]    
Segment Reporting Information [Line Items]    
Insurance Commissions and Fees 260 250
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]    
Segment Reporting Information [Line Items]    
Other Income 1 0
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] | Investment management and other fees    
Segment Reporting Information [Line Items]    
Insurance Commissions and Fees $ 11 $ 10