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Segment Information - Net Income (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Segment Reporting Information [Line Items]        
Net income $ 905 $ 468 $ 1,154 $ 741
Preferred stock dividends 5 5 10 10
Net income available to common stockholders 900 463 1,144 731
Corporate        
Segment Reporting Information [Line Items]        
Net income (21) 18 (79) (73)
Commercial Lines | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Net income 569 (66) 698 55
Personal Lines | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Net income 118 371 253 469
Property & Casualty Other Operations | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Net income 17 5 4 10
Group Benefits | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Net income 170 101 179 205
Hartford Funds | Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Net income $ 52 $ 39 $ 99 $ 75