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Segment Information - Non-insurance Revenue from Customers (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Segment Reporting Information [Line Items]        
Insurance Commissions and Fees $ 330 $ 328 $ 977 $ 1,031
Other revenues 21 21 66 56
Non-insurance revenues with customers 351 348 1,042 1,088
Installment billing fees [Member] | Operating Segments [Member] | Commercial Lines        
Segment Reporting Information [Line Items]        
Insurance Commissions and Fees 11 10 31 29
Installment billing fees [Member] | Operating Segments [Member] | Personal Lines        
Segment Reporting Information [Line Items]        
Insurance Commissions and Fees 7 8 22 23
Insurance servicing revenues | Operating Segments [Member] | Personal Lines        
Segment Reporting Information [Line Items]        
Other revenues 21 20 64 56
Administrative services | Operating Segments [Member] | Group Benefits        
Segment Reporting Information [Line Items]        
Insurance Commissions and Fees 54 46 161 139
Advisor, distribution and other management fees | Operating Segments [Member] | Hartford Funds        
Segment Reporting Information [Line Items]        
Insurance Commissions and Fees 248 253 733 803
Investment management and other fees | Corporate        
Segment Reporting Information [Line Items]        
Insurance Commissions and Fees 10 11 30 37
Other | Corporate        
Segment Reporting Information [Line Items]        
Other revenues $ 0 $ 0 $ 1 $ 1