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Segment Information - Net Income (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]        
Net income $ 738 $ 547 $ 1,491 $ 1,082
Net income available to common stockholders 733 542 1,481 1,072
Corporate        
Segment Reporting Information [Line Items]        
Net income (17) (26) (32) (50)
Commercial Lines | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Net income 540 458 1,113 879
Personal Lines | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Net income (11) (60) 23 (61)
Property & Casualty Other Operations | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Net income 11 9 19 15
Group Benefits | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Net income 171 121 279 213
Hartford Funds | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Net income $ 44 $ 45 $ 89 $ 86