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Segment Information - Revenues (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Segment Reporting Information [Line Items]      
Earned premiums and fee income $ 20,739 $ 19,487 $ 18,565
Total net investment income 2,177 2,313 1,846
Net realized gains (losses) (627) 509 (14)
Other revenues 73 81 126
Revenues 22,362 22,390 20,523
P&C Personal Lines | AARP Members      
Segment Reporting Information [Line Items]      
Earned premiums and fee income 2,700 2,700 2,800
Corporate      
Segment Reporting Information [Line Items]      
Earned premiums and fee income 49 50 58
Total net investment income 26 24 22
Operating Segments | P&C Commercial Lines      
Segment Reporting Information [Line Items]      
Earned premiums and fee income 10,610 9,575 8,940
Total net investment income 1,415 1,502 1,160
Operating Segments | P&C Commercial Lines | Workers’ compensation      
Segment Reporting Information [Line Items]      
Earned premiums and fee income 3,499 3,172 3,034
Operating Segments | P&C Commercial Lines | Liability      
Segment Reporting Information [Line Items]      
Earned premiums and fee income 1,836 1,622 1,401
Operating Segments | P&C Commercial Lines | Marine [Member]      
Segment Reporting Information [Line Items]      
Earned premiums and fee income 235 228 251
Operating Segments | P&C Commercial Lines | Package business      
Segment Reporting Information [Line Items]      
Earned premiums and fee income 1,844 1,665 1,540
Operating Segments | P&C Commercial Lines | Property      
Segment Reporting Information [Line Items]      
Earned premiums and fee income 845 829 793
Operating Segments | P&C Commercial Lines | Professional liability      
Segment Reporting Information [Line Items]      
Earned premiums and fee income 737 655 595
Operating Segments | P&C Commercial Lines | Bond      
Segment Reporting Information [Line Items]      
Earned premiums and fee income 303 287 274
Operating Segments | P&C Commercial Lines | Assumed Reinsurance [Member]      
Segment Reporting Information [Line Items]      
Earned premiums and fee income 467 328 298
Operating Segments | P&C Commercial Lines | Automobile      
Segment Reporting Information [Line Items]      
Earned premiums and fee income 844 789 754
Operating Segments | P&C Personal Lines      
Segment Reporting Information [Line Items]      
Earned premiums and fee income 2,979 2,986 3,042
Total net investment income 140 157 157
Operating Segments | P&C Personal Lines | Property      
Segment Reporting Information [Line Items]      
Earned premiums and fee income 932 927 961
Operating Segments | P&C Personal Lines | Automobile      
Segment Reporting Information [Line Items]      
Earned premiums and fee income 2,047 2,059 2,081
Operating Segments | Property & Casualty Other Operations      
Segment Reporting Information [Line Items]      
Earned premiums and fee income 0 0 0
Total net investment income 63 75 55
Operating Segments | Group Benefits [Member]      
Segment Reporting Information [Line Items]      
Earned premiums and fee income 6,057 5,687 5,536
Total net investment income 524 550 448
Operating Segments | Group Benefits [Member] | Group disability      
Segment Reporting Information [Line Items]      
Earned premiums and fee income 3,310 2,983 2,832
Operating Segments | Group Benefits [Member] | Group life      
Segment Reporting Information [Line Items]      
Earned premiums and fee income 2,393 2,388 2,434
Operating Segments | Group Benefits [Member] | Other      
Segment Reporting Information [Line Items]      
Earned premiums and fee income 354 316 270
Operating Segments | Hartford Funds      
Segment Reporting Information [Line Items]      
Earned premiums and fee income 1,044 1,189 989
Total net investment income 9 5 4
Operating Segments | Hartford Funds | Third party retail customers [Member]      
Segment Reporting Information [Line Items]      
Earned premiums and fee income 964 1,094 903
Operating Segments | Hartford Funds | Talcott Resolution [Member]      
Segment Reporting Information [Line Items]      
Earned premiums and fee income $ 80 $ 95 $ 86