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Segment Information - Non-insurance Revenue from Customers (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Segment Reporting Information [Line Items]        
Insurance Commissions and Fees $ 342 $ 339 $ 688 $ 672
Other Income 30 26 52 45
Non-insurance revenues with customers 366 364 732 716
Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Other Income 25 25 46 44
Operating Segments [Member] | P&C Business Insurance        
Segment Reporting Information [Line Items]        
Other Income 1 0 2 0
Operating Segments [Member] | P&C Personal Insurance        
Segment Reporting Information [Line Items]        
Other Income 24 25 44 44
Operating Segments [Member] | Employee Benefits [Member]        
Segment Reporting Information [Line Items]        
Other Income 0 0 0 0
Operating Segments [Member] | Hartford Funds [Member]        
Segment Reporting Information [Line Items]        
Other Income 0 0 0 0
Operating Segments [Member] | Installment billing fees [Member] | P&C Business Insurance        
Segment Reporting Information [Line Items]        
Insurance Commissions and Fees 11 11 22 22
Operating Segments [Member] | Installment billing fees [Member] | P&C Personal Insurance        
Segment Reporting Information [Line Items]        
Insurance Commissions and Fees 8 8 16 16
Operating Segments [Member] | Insurance servicing revenues | P&C Personal Insurance        
Segment Reporting Information [Line Items]        
Other Income 24 25 44 44
Operating Segments [Member] | Administrative services | Employee Benefits [Member]        
Segment Reporting Information [Line Items]        
Insurance Commissions and Fees 57 57 113 111
Operating Segments [Member] | Advisor, distribution and other management fees | Hartford Funds [Member]        
Segment Reporting Information [Line Items]        
Insurance Commissions and Fees 256 253 516 503
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]        
Segment Reporting Information [Line Items]        
Other Income 5 1 6 1
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] | Investment management and other fees        
Segment Reporting Information [Line Items]        
Insurance Commissions and Fees $ 10 $ 10 $ 21 $ 20