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Segment Information - Reconciliation of Other Items from Segments to Consolidated (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Segment Reporting Information [Line Items]        
Deferred Policy Acquisition Costs, Amortization Expense $ 625 $ 561 $ 1,232 $ 1,106
Insurance operating costs and other expense 1,337 1,285 2,689 2,568
Amortization of other intangible assets 17 17 35 35
Benefits, Losses and Expenses 5,741 5,574 11,768 11,082
Policyholder Benefits and Claims Incurred, Net 3,712 3,661 7,712 7,272
Operating Segments [Member]        
Segment Reporting Information [Line Items]        
Deferred Policy Acquisition Costs, Amortization Expense 625 561 1,232 1,106
Amortization of other intangible assets 17 17 35 35
Benefits, Losses and Expenses 5,656 5,491 11,600 10,915
Operating Segments [Member] | P&C Business Insurance        
Segment Reporting Information [Line Items]        
Prior accident year development [1] (146) (81) (229) (137)
Deferred Policy Acquisition Costs, Amortization Expense 546 489 1,077 965
Insurance operating costs and other expense 507 484 1,019 971
Amortization of other intangible assets 7 7 14 14
Policyholder Dividends, Expense 11 9 21 19
Benefits, Losses and Expenses 2,991 2,813 6,139 5,571
Operating Segments [Member] | P&C Personal Insurance        
Segment Reporting Information [Line Items]        
Prior accident year development [1] (41) (34) (80) (41)
Deferred Policy Acquisition Costs, Amortization Expense 70 63 138 123
Insurance operating costs and other expense 172 169 354 322
Amortization of other intangible assets 0 0 1 1
Benefits, Losses and Expenses 884 920 1,846 1,754
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 2 4 4
Amortization of other intangible assets 0 0 0 0
Benefits, Losses and Expenses 2 2 4 11
Operating Segments [Member] | Employee Benefits [Member]        
Segment Reporting Information [Line Items]        
Deferred Policy Acquisition Costs, Amortization Expense 9 9 17 18
Insurance operating costs and other expense 407 387 813 784
Amortization of other intangible assets 10 10 20 20
Benefits, Losses and Expenses 1,576 1,553 3,199 3,173
Operating Segments [Member] | Employee Benefits [Member] | Disability Insurance Policy [Member]        
Segment Reporting Information [Line Items]        
Policyholder Benefits and Claims Incurred, Net 617 601 1,238 1,225
Operating Segments [Member] | Employee Benefits [Member] | Life Insurance Product Line [Member]        
Segment Reporting Information [Line Items]        
Policyholder Benefits and Claims Incurred, Net 478 497 997 1,030
Operating Segments [Member] | Employee Benefits [Member] | Insurance, Other [Member]        
Segment Reporting Information [Line Items]        
Policyholder Benefits and Claims Incurred, Net 55 49 114 96
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 203 203 412 406
Investment Company, General Partner, Advisory Service Allocation 72 71 145 140
Employee Benefits and Share-Based Compensation 31 32 70 67
Selling Expense 70 74 143 147
Other General and Administrative Expense 30 26 54 52
Non-Catastrophe [Member] | Operating Segments [Member] | P&C Business Insurance        
Segment Reporting Information [Line Items]        
Current accident year 1,952 1,750 3,843 3,475
Non-Catastrophe [Member] | Operating Segments [Member] | P&C Personal Insurance        
Segment Reporting Information [Line Items]        
Current accident year 585 597 1,148 1,172
Catastrophe | Operating Segments [Member] | P&C Business Insurance        
Segment Reporting Information [Line Items]        
Current accident year 114 155 394 264
Catastrophe | Operating Segments [Member] | P&C Personal Insurance        
Segment Reporting Information [Line Items]        
Current accident year $ 98 $ 125 $ 285 $ 177