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Segment Information - Non-insurance Revenue from Customers (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Fee income $ 1,373 $ 1,300 $ 1,349
Other Income 88 84 73
Revenue from Contract with Customer, Excluding Assessed Tax 1,458 1,382 1,423
Operating Segments | P&C Business Insurance [Member]      
Segment Reporting Information [Line Items]      
Other Income 1 1 (1)
Operating Segments | P&C Personal Insurance [Member]      
Segment Reporting Information [Line Items]      
Other Income 85 81 73
Operating Segments | Employee Benefits [Member]      
Segment Reporting Information [Line Items]      
Other Income 0 0 0
Operating Segments | Hartford Funds      
Segment Reporting Information [Line Items]      
Other Income 0 0 0
Operating Segments | Installment billing fees [Member] | P&C Business Insurance [Member]      
Segment Reporting Information [Line Items]      
Fee income 43 41 39
Operating Segments | Installment billing fees [Member] | P&C Personal Insurance [Member]      
Segment Reporting Information [Line Items]      
Fee income 33 30 30
Operating Segments | Insurance servicing fees [Member] | P&C Personal Insurance [Member]      
Segment Reporting Information [Line Items]      
Other Income 85 81 73
Operating Segments | Administrative services fees [Member] | Employee Benefits [Member]      
Segment Reporting Information [Line Items]      
Fee income 222 217 187
Operating Segments | Advisor, distribution and other management fees [Member] | Hartford Funds      
Segment Reporting Information [Line Items]      
Fee income 1,035 973 1,044
Corporate      
Segment Reporting Information [Line Items]      
Other Income 2 2 1
Corporate | Investment management and other fees [Member]      
Segment Reporting Information [Line Items]      
Fee income 40 39 49
Corporate | Other      
Segment Reporting Information [Line Items]      
Other Income $ 0 $ 1 $ 1