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Segment Information - Reconciliation of Other Items from Segments to Consolidated (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Segment Reporting Information [Line Items]        
Deferred Policy Acquisition Costs, Amortization Expense $ 639 $ 585 $ 1,871 $ 1,691
Insurance operating costs and other expense 1,414 1,323 4,103 3,891
Amortization of other intangible assets 18 18 53 53
Benefits, Losses and Expenses 5,914 5,799 17,682 16,881
Policyholder Benefits and Claims Incurred, Net 3,793 3,823 11,505 11,095
Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Deferred Policy Acquisition Costs, Amortization Expense 639 585 1,871 1,691
Amortization of other intangible assets 18 18 53 53
Benefits, Losses and Expenses 5,827 5,713 17,427 16,628
Operating Segments [Member] | P&C Business Insurance        
Segment Reporting Information [Line Items]        
Prior accident year development [1] (60) (36) (289) (173)
Deferred Policy Acquisition Costs, Amortization Expense 559 512 1,636 1,477
Insurance operating costs and other expense 546 497 1,565 1,468
Amortization of other intangible assets 7 7 21 21
Policyholder Dividends, Expense 12 10 33 29
Benefits, Losses and Expenses 3,154 3,007 9,293 8,578
Operating Segments [Member] | P&C Personal Insurance        
Segment Reporting Information [Line Items]        
Prior accident year development [1] (43) (14) (123) (55)
Deferred Policy Acquisition Costs, Amortization Expense 72 65 210 188
Insurance operating costs and other expense 180 169 534 491
Amortization of other intangible assets 1 1 2 2
Benefits, Losses and Expenses 851 915 2,697 2,669
Operating Segments [Member] | Property & Casualty Other Operations [Member]        
Segment Reporting Information [Line Items]        
Prior accident year development [1] 0 0 0 7
Deferred Policy Acquisition Costs, Amortization Expense 0 0 0 0
Insurance operating costs and other expense 2 3 6 7
Amortization of other intangible assets 0 0 0 0
Benefits, Losses and Expenses 2 3 6 14
Operating Segments [Member] | Employee Benefits [Member]        
Segment Reporting Information [Line Items]        
Deferred Policy Acquisition Costs, Amortization Expense 8 8 25 26
Insurance operating costs and other expense 425 401 1,238 1,185
Amortization of other intangible assets 10 10 30 30
Benefits, Losses and Expenses 1,606 1,580 4,805 4,753
Operating Segments [Member] | Employee Benefits [Member] | Disability Insurance Policy [Member]        
Segment Reporting Information [Line Items]        
Policyholder Benefits and Claims Incurred, Net 628 604 1,866 1,829
Operating Segments [Member] | Employee Benefits [Member] | Life Insurance Product Line [Member]        
Segment Reporting Information [Line Items]        
Policyholder Benefits and Claims Incurred, Net 481 510 1,478 1,540
Operating Segments [Member] | Employee Benefits [Member] | Insurance, Other [Member]        
Segment Reporting Information [Line Items]        
Policyholder Benefits and Claims Incurred, Net 54 47 168 143
Operating Segments [Member] | Hartford Funds [Member]        
Segment Reporting Information [Line Items]        
Deferred Policy Acquisition Costs, Amortization Expense 0 0 0 0
Amortization of other intangible assets 0 0 0 0
Benefits, Losses and Expenses 214 208 626 614
Investment Company, General Partner, Advisory Service Allocation 79 73 224 213
Employee Benefits and Share-Based Compensation 33 31 103 98
Selling Expense 75 75 218 222
Other General and Administrative Expense 27 29 81 81
Non-Catastrophe [Member] | Operating Segments [Member] | P&C Business Insurance        
Segment Reporting Information [Line Items]        
Current accident year 2,051 1,862 5,894 5,337
Non-Catastrophe [Member] | Operating Segments [Member] | P&C Personal Insurance        
Segment Reporting Information [Line Items]        
Current accident year 610 602 1,758 1,774
Catastrophe | Operating Segments [Member] | P&C Business Insurance        
Segment Reporting Information [Line Items]        
Current accident year 39 155 433 419
Catastrophe | Operating Segments [Member] | P&C Personal Insurance        
Segment Reporting Information [Line Items]        
Current accident year $ 31 $ 92 $ 316 $ 269