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Schedule III Supplementary Insurance Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Schedule of Supplementary Insurance Information [Abstract]      
Deferred Policy Acquisition Costs $ 670 $ 650  
Unpaid Losses and Loss Adjustment Expenses 33,029 32,287  
Reserve for Future Policy Benefits 642 713  
Unearned Premiums 5,282 5,322  
Other Policyholder Funds and Benefits Payable 767 816  
Earned Premiums, Fee Income and Other 17,287 15,394 $ 14,824
Net Investment Income 1,780 1,603 1,577
Benefits, Losses and Loss Adjustment Expenses 11,165 10,174 9,961
Amortization of Deferred Policy Acquisition Costs 1,384 1,372 1,377
Insurance Operating Costs and Other Expenses 4,653 4,893 4,506
Net Written Premiums 10,408 10,517 10,568
Operating Segments | Commercial Lines      
Schedule of Supplementary Insurance Information [Abstract]      
Deferred Policy Acquisition Costs 495 467  
Unpaid Losses and Loss Adjustment Expenses 19,455 18,893  
Reserve for Future Policy Benefits 0 0  
Unearned Premiums 3,589 3,504  
Other Policyholder Funds and Benefits Payable 0 0  
Earned Premiums, Fee Income and Other 7,081 6,902 6,690
Net Investment Income 997 949 917
Benefits, Losses and Loss Adjustment Expenses 4,112 4,322 3,994
Amortization of Deferred Policy Acquisition Costs 1,048 1,009 973
Insurance Operating Costs and Other Expenses 1,396 1,381 1,244
Net Written Premiums 7,136 6,956 6,732
Operating Segments | Personal Lines      
Schedule of Supplementary Insurance Information [Abstract]      
Deferred Policy Acquisition Costs 117 127  
Unpaid Losses and Loss Adjustment Expenses 2,456 2,294  
Reserve for Future Policy Benefits 0 0  
Unearned Premiums 1,643 1,768  
Other Policyholder Funds and Benefits Payable 0 0  
Earned Premiums, Fee Income and Other 3,523 3,819 4,023
Net Investment Income 155 141 135
Benefits, Losses and Loss Adjustment Expenses 2,763 3,000 3,175
Amortization of Deferred Policy Acquisition Costs 275 309 348
Insurance Operating Costs and Other Expenses 684 649 669
Net Written Premiums 3,276 3,561 3,837
Operating Segments | Property & Casualty Other Operations      
Schedule of Supplementary Insurance Information [Abstract]      
Deferred Policy Acquisition Costs 0 0  
Unpaid Losses and Loss Adjustment Expenses 2,673 2,588  
Reserve for Future Policy Benefits 0 0  
Unearned Premiums 7 10  
Other Policyholder Funds and Benefits Payable 0 0  
Earned Premiums, Fee Income and Other 0 0 0
Net Investment Income 90 106 127
Benefits, Losses and Loss Adjustment Expenses 65 18 278
Amortization of Deferred Policy Acquisition Costs 0 0 0
Insurance Operating Costs and Other Expenses 13 9 663
Net Written Premiums (4) 0 (1)
Operating Segments | Group Benefits      
Schedule of Supplementary Insurance Information [Abstract]      
Deferred Policy Acquisition Costs 52 47  
Unpaid Losses and Loss Adjustment Expenses 8,445 8,512  
Reserve for Future Policy Benefits 427 441  
Unearned Premiums 43 40  
Other Policyholder Funds and Benefits Payable 455 492  
Earned Premiums, Fee Income and Other 5,598 3,677 3,223
Net Investment Income 474 381 366
Benefits, Losses and Loss Adjustment Expenses 4,214 2,803 2,514
Amortization of Deferred Policy Acquisition Costs 45 33 31
Insurance Operating Costs and Other Expenses 1,342 924 776
Net Written Premiums 0 0 0
Operating Segments | Hartford Funds      
Schedule of Supplementary Insurance Information [Abstract]      
Deferred Policy Acquisition Costs 6 9  
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 1,032 992 885
Net Investment Income 5 3 1
Benefits, Losses and Loss Adjustment Expenses 0 0 0
Amortization of Deferred Policy Acquisition Costs 16 21 24
Insurance Operating Costs and Other Expenses 831 805 741
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 215 272  
Unearned Premiums 0 0  
Other Policyholder Funds and Benefits Payable 312 324  
Earned Premiums, Fee Income and Other 53 4 3
Net Investment Income 59 23 31
Benefits, Losses and Loss Adjustment Expenses 11 31 0
Amortization of Deferred Policy Acquisition Costs 0 0 1
Insurance Operating Costs and Other Expenses 387 1,125 413
Net Written Premiums $ 0 $ 0 $ 0