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Segment Information - Non-insurance Revenue from Customers (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Segment Reporting Information [Line Items]        
Insurance Commissions and Fees $ 339 $ 328 $ 672 $ 647
Other revenues 26 25 45 45
Non-insurance revenues with customers 364 352 716 690
Installment billing fees [Member] | Operating Segments [Member] | Commercial Lines        
Segment Reporting Information [Line Items]        
Insurance Commissions and Fees 11 10 22 20
Installment billing fees [Member] | Operating Segments [Member] | Personal Lines        
Segment Reporting Information [Line Items]        
Insurance Commissions and Fees 8 7 16 15
Insurance servicing revenues | Operating Segments [Member] | Personal Lines        
Segment Reporting Information [Line Items]        
Other revenues 25 24 44 43
Administrative services | Operating Segments [Member] | Group Benefits        
Segment Reporting Information [Line Items]        
Insurance Commissions and Fees 57 56 111 107
Advisor, distribution and other management fees | Operating Segments [Member] | Hartford Funds        
Segment Reporting Information [Line Items]        
Insurance Commissions and Fees 253 244 503 485
Investment management and other fees | Corporate        
Segment Reporting Information [Line Items]        
Insurance Commissions and Fees $ 10 $ 11 $ 20 $ 20