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Segment Information - Non-insurance Revenue from Customers (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Segment Reporting Information [Line Items]        
Insurance Commissions and Fees $ 328 $ 341 $ 647 $ 703
Other revenues 25 19 45 35
Non-insurance revenues with customers 352 361 690 740
Installment billing fees [Member] | Operating Segments [Member] | Commercial Lines        
Segment Reporting Information [Line Items]        
Insurance Commissions and Fees 10 10 20 19
Installment billing fees [Member] | Operating Segments [Member] | Personal Lines        
Segment Reporting Information [Line Items]        
Insurance Commissions and Fees 7 7 15 15
Insurance servicing revenues | Operating Segments [Member] | Personal Lines        
Segment Reporting Information [Line Items]        
Other revenues 24 19 43 36
Administrative services | Operating Segments [Member] | Group Benefits        
Segment Reporting Information [Line Items]        
Insurance Commissions and Fees 56 48 107 93
Advisor, distribution and other management fees | Operating Segments [Member] | Hartford Funds        
Segment Reporting Information [Line Items]        
Insurance Commissions and Fees 244 263 485 550
Investment management and other fees | Corporate        
Segment Reporting Information [Line Items]        
Insurance Commissions and Fees 11 13 20 26
Other | Corporate        
Segment Reporting Information [Line Items]        
Other revenues $ 0 $ 1 $ 0 $ 1