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Segment Information - Net Income From Segments to Consolidated (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Earned premiums and fee income $ 23,940 $ 22,326 $ 20,739
Fee income 1,373 1,300 1,349
Total net investment income 2,568 2,305 2,177
Net realized losses (61) (188) (627)
Other Income 88 84 73
Revenues 26,535 24,527 22,362
Benefits, losses and expenses 22,686 21,439 20,100
Segment Reporting, Other Segment Item, Amount 77 62 67
Income tax expense 738 584 443
Net income (loss) 3,111 2,504 1,819
Amortization of deferred policy acquisition costs ("DAC") 2,282 2,044 1,824
Amortization of other intangible assets 71 71 71
Total assets 80,917 76,780  
Reportable Segment, Aggregation before Other Operating Segment      
Segment Reporting Information [Line Items]      
Earned premiums and fee income 23,900 22,287 20,690
Total net investment income 2,505 2,258 2,151
Net realized losses (103) (214) (582)
Other Income 86 82 72
Revenues 26,388 24,413 22,331
Benefits, losses and expenses 22,346 21,097 19,738
Segment Reporting, Other Segment Item, Amount 77 62 67
Income tax expense 782 629 512
Net income (loss) 3,183 2,625 2,014
Amortization of deferred policy acquisition costs ("DAC") 2,282 2,044 1,824
Amortization of other intangible assets 71 71 71
Total assets 77,905 73,906  
Operating Segments      
Segment Reporting Information [Line Items]      
Revenues 26,388 24,413 22,331
Benefits, losses and expenses 22,346 21,097 19,738
Operating Segments | P&C Business Insurance [Member]      
Segment Reporting Information [Line Items]      
Earned premiums and fee income 12,764 11,682 10,610
Total net investment income 1,714 1,532 1,415
Net realized losses (73) (156) (385)
Other Income 1 1 (1)
Revenues 14,406 13,059 11,639
Benefits, losses and expenses 11,475 10,470 9,578
Segment Reporting, Other Segment Item, Amount 6 2 11
Income tax expense 576 502 426
Net income (loss) 2,349 2,085 1,624
Amortization of deferred policy acquisition costs ("DAC") 1,993 1,779 1,563
Amortization of other intangible assets 29 29 29
Total assets 53,296 49,711  
Operating Segments | P&C Personal Insurance [Member]      
Segment Reporting Information [Line Items]      
Earned premiums and fee income 3,486 3,117 2,979
Total net investment income 222 171 140
Net realized losses (14) (16) (35)
Other Income 85 81 73
Revenues 3,779 3,353 3,157
Benefits, losses and expenses 3,455 3,347 2,988
Segment Reporting, Other Segment Item, Amount 67 60 56
Income tax expense 49 (15) 22
Net income (loss) 208 (39) 91
Amortization of deferred policy acquisition costs ("DAC") 255 231 228
Amortization of other intangible assets 2 2 2
Total assets 6,034 5,579  
Operating Segments | Property & Casualty Other Operations [Member]      
Segment Reporting Information [Line Items]      
Earned premiums and fee income 0 0 0
Total net investment income 74 69 63
Net realized losses (4) (7) (16)
Other Income 0 0 0
Revenues 70 62 47
Benefits, losses and expenses 228 228 289
Segment Reporting, Other Segment Item, Amount 4 0 0
Income tax expense (35) (36) (52)
Net income (loss) (127) (130) (190)
Amortization of deferred policy acquisition costs ("DAC") 0 0 0
Amortization of other intangible assets 0 0 0
Total assets 4,312 4,235  
Operating Segments | Employee Benefits [Member]      
Segment Reporting Information [Line Items]      
Earned premiums and fee income 6,615 6,515 6,057
Total net investment income 475 469 524
Net realized losses (24) (45) (122)
Other Income 0 0 0
Revenues 7,066 6,939 6,459
Benefits, losses and expenses 6,364 6,271 6,057
Segment Reporting, Other Segment Item, Amount 0 0 0
Income tax expense 141 133 75
Net income (loss) 561 535 327
Amortization of deferred policy acquisition costs ("DAC") 34 34 33
Amortization of other intangible assets 40 40 40
Total assets 13,502 13,697  
Operating Segments | Hartford Funds      
Segment Reporting Information [Line Items]      
Earned premiums and fee income 1,035 973 1,044
Total net investment income 20 17 9
Net realized losses 12 10 (24)
Other Income 0 0 0
Revenues 1,067 1,000 1,029
Benefits, losses and expenses 824 781 826
Segment Reporting, Other Segment Item, Amount 0 0 0
Income tax expense 51 45 41
Net income (loss) 192 174 162
Amortization of deferred policy acquisition costs ("DAC") 0 0 0
Amortization of other intangible assets 0 0 0
Total assets 761 684  
Corporate      
Segment Reporting Information [Line Items]      
Total net investment income 63 47 26
Net realized losses 42 26 (45)
Other Income 2 2 1
Revenues 147 114 31
Benefits, losses and expenses 263 280 295
Income tax expense (44) (45) (69)
Net income (loss) (72) (121) (195)
Amortization of deferred policy acquisition costs ("DAC") 0 0 0
Amortization of other intangible assets 0 0 0
Total assets 3,012 2,874  
Corporate | Investment management and other fees [Member]      
Segment Reporting Information [Line Items]      
Fee income $ 40 $ 39 $ 49