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Segment Information - Reconciliation of Other Items 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]      
Amortization of deferred policy acquisition costs ("DAC") $ 2,282 $ 2,044 $ 1,824
Insurance operating costs and other expenses 5,258 4,881 4,841
Amortization of other intangible assets 71 71 71
Policyholder Dividends, Expense 39 39 29
Benefits, losses and expenses 22,686 21,439 20,100
Benefits, losses and loss adjustment expenses 14,874 14,238 13,138
Operating Segments      
Segment Reporting Information [Line Items]      
Benefits, losses and expenses 22,346 21,097 19,738
Operating Segments | P&C Business Insurance [Member]      
Segment Reporting Information [Line Items]      
Prior accident year development [1] (231) (225) (231)
Amortization of deferred policy acquisition costs ("DAC") 1,993 1,779 1,563
Insurance operating costs and other expenses 1,973 1,837 1,788
Amortization of other intangible assets 29 29 29
Policyholder Dividends, Expense 39 39 29
Benefits, losses and expenses 11,475 10,470 9,578
Operating Segments | P&C Personal Insurance [Member]      
Segment Reporting Information [Line Items]      
Prior accident year development [1] (108) 11 (13)
Amortization of deferred policy acquisition costs ("DAC") 255 231 228
Insurance operating costs and other expenses 673 576 594
Amortization of other intangible assets 2 2 2
Benefits, losses and expenses 3,455 3,347 2,988
Operating Segments | Property & Casualty Other Operations [Member]      
Segment Reporting Information [Line Items]      
Prior accident year development [1] 219 224 280
Amortization of deferred policy acquisition costs ("DAC") 0 0 0
Insurance operating costs and other expenses 9 4 9
Amortization of other intangible assets 0 0 0
Benefits, losses and expenses 228 228 289
Operating Segments | Employee Benefits [Member]      
Segment Reporting Information [Line Items]      
Amortization of deferred policy acquisition costs ("DAC") 34 34 33
Insurance operating costs and other expenses 1,609 1,514 1,467
Amortization of other intangible assets 40 40 40
Benefits, losses and expenses 6,364 6,271 6,057
Operating Segments | Employee Benefits [Member] | Disability Insurance Policy [Member]      
Segment Reporting Information [Line Items]      
Benefits, losses and loss adjustment expenses 2,432 2,370 2,263
Operating Segments | Employee Benefits [Member] | Life Insurance Product Line [Member]      
Segment Reporting Information [Line Items]      
Benefits, losses and loss adjustment expenses 2,060 2,157 2,091
Operating Segments | Employee Benefits [Member] | Insurance, Other [Member]      
Segment Reporting Information [Line Items]      
Benefits, losses and loss adjustment expenses 189 156 163
Operating Segments | Hartford Funds      
Segment Reporting Information [Line Items]      
Amortization of deferred policy acquisition costs ("DAC") 0 0 0
Amortization of other intangible assets 0 0 0
Benefits, losses and expenses 824 781 826
Investment Advisory, Management and Administrative Service 289 265 282
Employee Benefits and Share-Based Compensation 131 121 123
Distribution Service 299 289 315
Other General and Administrative Expense 105 106 106
Non-Catastrophe | Operating Segments | P&C Business Insurance [Member]      
Segment Reporting Information [Line Items]      
Current Year Claims and Claims Adjustment Expense 7,186 6,575 5,959
Non-Catastrophe | Operating Segments | P&C Personal Insurance [Member]      
Segment Reporting Information [Line Items]      
Current Year Claims and Claims Adjustment Expense 2,351 2,287 1,969
Catastrophes | Operating Segments | P&C Business Insurance [Member]      
Segment Reporting Information [Line Items]      
Current Year Claims and Claims Adjustment Expense 486 436 441
Catastrophes | Operating Segments | P&C Personal Insurance [Member]      
Segment Reporting Information [Line Items]      
Current Year Claims and Claims Adjustment Expense $ 282 $ 240 $ 208