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Segment Information - Non-insurance Revenue from Customers (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Segment Reporting Information [Line Items]        
Insurance Commissions and Fees $ 347 $ 330 $ 1,019 $ 977
Other revenues 24 21 69 66
Non-insurance revenues with customers 369 351 1,085 1,042
Operating Segments [Member] | Installment billing fees [Member] | Commercial Lines        
Segment Reporting Information [Line Items]        
Insurance Commissions and Fees 11 11 33 31
Operating Segments [Member] | Installment billing fees [Member] | Personal Lines        
Segment Reporting Information [Line Items]        
Insurance Commissions and Fees 8 7 24 22
Operating Segments [Member] | Insurance servicing revenues | Personal Lines        
Segment Reporting Information [Line Items]        
Other revenues 22 21 66 64
Operating Segments [Member] | Administrative services | Group Benefits        
Segment Reporting Information [Line Items]        
Insurance Commissions and Fees 55 54 166 161
Operating Segments [Member] | Advisor, distribution and other management fees | Hartford Funds        
Segment Reporting Information [Line Items]        
Insurance Commissions and Fees 263 248 766 733
Corporate | Investment management and other fees        
Segment Reporting Information [Line Items]        
Insurance Commissions and Fees 10 10 30 30
Corporate | Other        
Segment Reporting Information [Line Items]        
Other revenues $ 0 $ 0 $ 0 $ 1