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Segment Information - Net Income (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]        
Net income $ 767 $ 651 $ 2,258 $ 1,733
Net income available to common stockholders 761 645 2,242 1,717
Operating Segments [Member] | Commercial Lines        
Segment Reporting Information [Line Items]        
Net income 528 519 1,641 1,398
Operating Segments [Member] | Personal Lines        
Segment Reporting Information [Line Items]        
Net income 31 (12) 54 (73)
Operating Segments [Member] | Property & Casualty Other Operations        
Segment Reporting Information [Line Items]        
Net income 10 9 29 24
Operating Segments [Member] | Group Benefits        
Segment Reporting Information [Line Items]        
Net income 156 146 435 359
Operating Segments [Member] | Hartford Funds        
Segment Reporting Information [Line Items]        
Net income 54 41 143 127
Corporate        
Segment Reporting Information [Line Items]        
Net income $ (12) $ (52) $ (44) $ (102)