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Segment Information - Reconciliation of Other Items from Segments to Consolidated (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Segment Reporting Information [Line Items]    
Deferred Policy Acquisition Costs, Amortization Expense $ 607 $ 545
Insurance operating costs and other expense 1,352 1,283
Amortization of other intangible assets 18 18
Benefits, Losses and Expenses 6,027 5,508
Policyholder Benefits and Claims Incurred, Net 4,000 3,611
Operating Segments [Member]    
Segment Reporting Information [Line Items]    
Deferred Policy Acquisition Costs, Amortization Expense 607 545
Amortization of other intangible assets 18 18
Benefits, Losses and Expenses 5,944 5,424
Operating Segments [Member] | P&C Business Insurance    
Segment Reporting Information [Line Items]    
Prior accident year development [1] (83) (56)
Deferred Policy Acquisition Costs, Amortization Expense 531 476
Insurance operating costs and other expense 512 487
Amortization of other intangible assets 7 7
Policyholder Dividends, Expense 10 10
Benefits, Losses and Expenses 3,148 2,758
Operating Segments [Member] | P&C Personal Insurance    
Segment Reporting Information [Line Items]    
Prior accident year development [1] (39) (7)
Deferred Policy Acquisition Costs, Amortization Expense 68 60
Insurance operating costs and other expense 182 153
Amortization of other intangible assets 1 1
Benefits, Losses and Expenses 962 834
Operating Segments [Member] | Property & Casualty Other Operations [Member]    
Segment Reporting Information [Line Items]    
Prior accident year development [1] 0 7
Deferred Policy Acquisition Costs, Amortization Expense 0 0
Insurance operating costs and other expense 2 2
Amortization of other intangible assets 0 0
Benefits, Losses and Expenses 2 9
Operating Segments [Member] | Employee Benefits [Member]    
Segment Reporting Information [Line Items]    
Deferred Policy Acquisition Costs, Amortization Expense 8 9
Insurance operating costs and other expense 406 397
Amortization of other intangible assets 10 10
Benefits, Losses and Expenses 1,623 1,620
Operating Segments [Member] | Employee Benefits [Member] | Disability Insurance Policy [Member]    
Segment Reporting Information [Line Items]    
Policyholder Benefits and Claims Incurred, Net 621 624
Operating Segments [Member] | Employee Benefits [Member] | Life Insurance Product Line [Member]    
Segment Reporting Information [Line Items]    
Policyholder Benefits and Claims Incurred, Net 519 533
Operating Segments [Member] | Employee Benefits [Member] | Insurance, Other [Member]    
Segment Reporting Information [Line Items]    
Policyholder Benefits and Claims Incurred, Net 59 47
Operating Segments [Member] | Hartford Funds [Member]    
Segment Reporting Information [Line Items]    
Deferred Policy Acquisition Costs, Amortization Expense 0 0
Amortization of other intangible assets 0 0
Benefits, Losses and Expenses 209 203
Investment Company, General Partner, Advisory Service Allocation 73 69
Employee Benefits and Share-Based Compensation 39 35
Selling Expense 73 73
Other General and Administrative Expense 24 26
Non-Catastrophe [Member] | Operating Segments [Member] | P&C Business Insurance    
Segment Reporting Information [Line Items]    
Current accident year 1,891 1,725
Non-Catastrophe [Member] | Operating Segments [Member] | P&C Personal Insurance    
Segment Reporting Information [Line Items]    
Current accident year 563 575
Catastrophe | Operating Segments [Member] | P&C Business Insurance    
Segment Reporting Information [Line Items]    
Current accident year 280 109
Catastrophe | Operating Segments [Member] | P&C Personal Insurance    
Segment Reporting Information [Line Items]    
Current accident year $ 187 $ 52