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Segment Information - Net Income (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2023
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Dec. 31, 2022
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]                      
Net income (loss) $ 771 $ 651 $ 547 $ 535 $ 592 $ 340 $ 444 $ 443 $ 2,504 $ 1,819 $ 2,371
Less: Preferred stock dividends 5 6 5 5 5 6 5 5 21 21 21
Net income (loss) available to common stockholders $ 766 $ 645 $ 542 $ 530 $ 587 $ 334 $ 439 $ 438 2,483 1,798 2,350
Operating Segments | P&C Commercial Lines                      
Segment Reporting Information [Line Items]                      
Net income (loss)                 2,085 1,624 1,757
Operating Segments | P&C Personal Lines                      
Segment Reporting Information [Line Items]                      
Net income (loss)                 (39) 91 385
Operating Segments | Property & Casualty Other Operations                      
Segment Reporting Information [Line Items]                      
Net income (loss)                 (130) (190) (95)
Operating Segments | Group Benefits [Member]                      
Segment Reporting Information [Line Items]                      
Net income (loss)                 535 327 256
Operating Segments | Hartford Funds                      
Segment Reporting Information [Line Items]                      
Net income (loss)                 174 162 217
Corporate                      
Segment Reporting Information [Line Items]                      
Net income (loss)                 $ (121) $ (195) $ (149)