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Schedule III Supplementary Insurance Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Schedule of Supplementary Insurance Information [Abstract]        
Deferred Policy Acquisition Costs $ 789 $ 785    
Unpaid Losses and Loss Adjustment Expenses 37,855 36,517    
Reserve for Future Policy Benefits 638 635    
Unearned Premiums 6,629 6,635    
Other Policyholder Funds and Benefits Payable 701 755    
Earned Premiums, Fee Income and Other 18,691 18,394 $ 17,287  
Net Investment Income 1,846 1,951 1,780  
Benefits, Losses and Loss Adjustment Expenses 11,805 11,472 11,165  
Amortization of Deferred Policy Acquisition Costs 1,706 1,622 1,384  
Insurance Operating Costs and Other Expenses 4,892 5,086 4,653  
Net Written Premiums 11,914 11,595 10,408  
Group Insurance Policy [Member]        
Schedule of Supplementary Insurance Information [Abstract]        
Unpaid Losses and Loss Adjustment Expenses 8,233 8,256 8,445 $ 8,512
Operating Segments | Property and Casualty, Commercial Insurance [Member]        
Schedule of Supplementary Insurance Information [Abstract]        
Deferred Policy Acquisition Costs 641 615    
Unpaid Losses and Loss Adjustment Expenses 25,058 23,363    
Reserve for Future Policy Benefits 0 0    
Unearned Premiums 5,081 5,015    
Other Policyholder Funds and Benefits Payable 0 0    
Earned Premiums, Fee Income and Other 8,941 8,326 7,081  
Net Investment Income 1,160 1,129 997  
Benefits, Losses and Loss Adjustment Expenses 5,929 5,192 4,112  
Amortization of Deferred Policy Acquisition Costs 1,397 1,296 1,048  
Insurance Operating Costs and Other Expenses 1,683 1,776 1,396  
Net Written Premiums 8,969 8,452 7,136  
Operating Segments | Property and Casualty, Personal Insurance [Member]        
Schedule of Supplementary Insurance Information [Abstract]        
Deferred Policy Acquisition Costs 103 111    
Unpaid Losses and Loss Adjustment Expenses 1,836 2,201    
Reserve for Future Policy Benefits 0 0    
Unearned Premiums 1,506 1,578    
Other Policyholder Funds and Benefits Payable 0 0    
Earned Premiums, Fee Income and Other 3,123 3,318 3,523  
Net Investment Income 157 179 155  
Benefits, Losses and Loss Adjustment Expenses 1,466 2,185 2,763  
Amortization of Deferred Policy Acquisition Costs 244 259 275  
Insurance Operating Costs and Other Expenses 663 702 684  
Net Written Premiums 2,936 3,131 3,276  
Operating Segments | Property & Casualty Other Operations        
Schedule of Supplementary Insurance Information [Abstract]        
Deferred Policy Acquisition Costs 0 0    
Unpaid Losses and Loss Adjustment Expenses 2,728 2,697    
Reserve for Future Policy Benefits 0 0    
Unearned Premiums 2 3    
Other Policyholder Funds and Benefits Payable 0 0    
Earned Premiums, Fee Income and Other 0 2 0  
Net Investment Income 55 84 90  
Benefits, Losses and Loss Adjustment Expenses 258 21 65  
Amortization of Deferred Policy Acquisition Costs 0 0 0  
Insurance Operating Costs and Other Expenses 10 12 13  
Net Written Premiums 0 0 4  
Operating Segments | Group Insurance Policy [Member]        
Schedule of Supplementary Insurance Information [Abstract]        
Deferred Policy Acquisition Costs 38 51    
Unpaid Losses and Loss Adjustment Expenses 8,233 8,256    
Reserve for Future Policy Benefits 420 411    
Unearned Premiums 40 39    
Other Policyholder Funds and Benefits Payable 415 459    
Earned Premiums, Fee Income and Other 5,536 5,603 5,598  
Net Investment Income 448 486 474  
Benefits, Losses and Loss Adjustment Expenses 4,137 4,055 4,214  
Amortization of Deferred Policy Acquisition Costs 50 54 45  
Insurance Operating Costs and Other Expenses 1,348 1,352 1,342  
Net Written Premiums 0 0 0  
Operating Segments | Hartford Funds        
Schedule of Supplementary Insurance Information [Abstract]        
Deferred Policy Acquisition Costs 7 8    
Unpaid Losses and Loss Adjustment Expenses 0 0    
Reserve for Future Policy Benefits 0 0    
Unearned Premiums 0 0    
Other Policyholder Funds and Benefits Payable 0 0    
Earned Premiums, Fee Income and Other 989 999 1,032  
Net Investment Income 4 7 5  
Benefits, Losses and Loss Adjustment Expenses 0 0 0  
Amortization of Deferred Policy Acquisition Costs 14 12 16  
Insurance Operating Costs and Other Expenses 773 813 831  
Net Written Premiums 0 0 0  
Corporate        
Schedule of Supplementary Insurance Information [Abstract]        
Deferred Policy Acquisition Costs 0 0    
Unpaid Losses and Loss Adjustment Expenses 0 0    
Reserve for Future Policy Benefits 218 224    
Unearned Premiums 0 0    
Other Policyholder Funds and Benefits Payable 286 296    
Earned Premiums, Fee Income and Other 102 146 53  
Net Investment Income 22 66 59  
Benefits, Losses and Loss Adjustment Expenses 15 19 11  
Amortization of Deferred Policy Acquisition Costs 1 1 0  
Insurance Operating Costs and Other Expenses 415 431 387  
Net Written Premiums $ 9 $ 12 $ 0