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Segment Information - Non-insurance Revenue from Customers (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Insurance Commissions and Fees $ 361 $ 347 $ 1,049 $ 1,019
Other Income 31 24 83 69
Non-insurance revenues with customers 386 369 1,118 1,085
Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Other Income 25 23 71 67
Operating Segments [Member] | P&C Business Insurance        
Segment Reporting Information [Line Items]        
Other Income 0 1 2 1
Operating Segments [Member] | P&C Personal Insurance        
Segment Reporting Information [Line Items]        
Other Income 25 22 69 66
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 33 33
Operating Segments [Member] | Installment billing fees [Member] | P&C Personal Insurance        
Segment Reporting Information [Line Items]        
Insurance Commissions and Fees 8 8 24 24
Operating Segments [Member] | Insurance servicing revenues | P&C Personal Insurance        
Segment Reporting Information [Line Items]        
Other Income 25 22 69 66
Operating Segments [Member] | Administrative services | Employee Benefits [Member]        
Segment Reporting Information [Line Items]        
Insurance Commissions and Fees 55 55 168 166
Operating Segments [Member] | Advisor, distribution and other management fees | Hartford Funds [Member]        
Segment Reporting Information [Line Items]        
Insurance Commissions and Fees 277 263 793 766
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]        
Segment Reporting Information [Line Items]        
Other Income 6 1 12 2
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] | Investment management and other fees        
Segment Reporting Information [Line Items]        
Insurance Commissions and Fees $ 10 $ 10 $ 31 $ 30