v3.26.3
Segment Information - Net Income From Segments to Consolidated (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Segment Reporting [Line Items]        
Earned premiums and fee income $ 6,438 $ 6,177 $ 19,035 $ 18,145
Insurance Commissions and Fees 87 84 260 256
Net Investment Income 850 755 2,384 2,065
Net realized losses (116) (17) (104) (85)
Other Income 48 31 109 83
Total revenues 7,220 6,946 21,424 20,208
Benefits, Losses and Expenses 5,637 5,703 17,619 17,067
Segment Reporting, Other Segment Item, Amount 22 22 65 60
Income tax expense 321 222 759 598
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent 1,262 1,021 3,046 2,543
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent 61 59 431 162
Net income 1,323 1,080 3,477 2,705
Deferred Policy Acquisition Costs, Amortization Expense 679 639 2,004 1,871
Amortization of other intangible assets 18 18 53 53
Operating Segments [Member]        
Segment Reporting [Line Items]        
Earned premiums and fee income 6,427 6,167 19,003 18,114
Net Investment Income 832 741 2,332 2,023
Net realized losses (121) (38) (130) (110)
Other Income 24 25 72 71
Total revenues 7,162 6,895 21,277 20,098
Benefits, Losses and Expenses 5,547 5,613 17,319 16,801
Segment Reporting, Other Segment Item, Amount 22 22 65 60
Income tax expense 325 255 792 654
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent 1,268 1,005 3,101 2,583
Net income 1,268 1,005 3,101 2,583
Deferred Policy Acquisition Costs, Amortization Expense 679 639 2,004 1,871
Amortization of other intangible assets 18 18 53 53
Operating Segments [Member] | P&C Business Insurance        
Segment Reporting [Line Items]        
Earned premiums and fee income 3,787 3,551 11,046 10,321
Net Investment Income 589 519 1,650 1,405
Net realized losses (117) (26) (124) (70)
Other Income 0 0 1 2
Total revenues 4,259 4,044 12,573 11,658
Benefits, Losses and Expenses 3,460 3,154 10,218 9,293
Segment Reporting, Other Segment Item, Amount 3 0 4 4
Income tax expense 159 180 474 478
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent 637 710 1,877 1,883
Net income 637 710 1,877 1,883
Deferred Policy Acquisition Costs, Amortization Expense 600 559 1,767 1,636
Amortization of other intangible assets 7 7 21 21
Operating Segments [Member] | P&C Personal Insurance        
Segment Reporting [Line Items]        
Earned premiums and fee income 921 958 2,748 2,804
Net Investment Income 67 67 196 182
Net realized losses (15) (4) (15) (10)
Other Income 24 25 71 69
Total revenues 997 1,046 3,000 3,045
Benefits, Losses and Expenses 859 851 2,483 2,697
Segment Reporting, Other Segment Item, Amount 19 21 61 55
Income tax expense 26 35 94 58
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent 93 139 362 235
Net income 93 139 362 235
Deferred Policy Acquisition Costs, Amortization Expense 70 72 211 210
Amortization of other intangible assets 1 1 2 2
Operating Segments [Member] | Property & Casualty Other Operations [Member]        
Segment Reporting [Line Items]        
Earned premiums and fee income 0 0 0 0
Net Investment Income 22 19 64 56
Net realized losses (4) 0 (4) (2)
Other Income 0 0 0 0
Total revenues 18 19 60 54
Benefits, Losses and Expenses (495) 2 (527) 6
Segment Reporting, Other Segment Item, Amount 0 1 0 1
Income tax expense 107 4 122 9
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent 406 12 465 38
Net income 406 12 465 38
Deferred Policy Acquisition Costs, Amortization Expense 0 0 0 0
Amortization of other intangible assets 0 0 0 0
Operating Segments [Member] | Employee Benefits [Member]        
Segment Reporting [Line Items]        
Earned premiums and fee income 1,719 1,658 5,209 4,989
Net Investment Income 154 136 422 380
Net realized losses 15 (8) 13 (28)
Other Income 0 0 0 0
Total revenues 1,888 1,786 5,644 5,341
Benefits, Losses and Expenses 1,723 1,606 5,145 4,805
Segment Reporting, Other Segment Item, Amount 0 0 0 0
Income tax expense 33 36 102 109
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent 132 144 397 427
Net income 132 144 397 427
Deferred Policy Acquisition Costs, Amortization Expense 9 8 26 25
Amortization of other intangible assets 10 10 30 30
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]        
Segment Reporting [Line Items]        
Net Investment Income 18 14 52 42
Net realized losses 5 21 26 25
Other Income 24 6 37 12
Total revenues 58 51 147 110
Benefits, Losses and Expenses 68 68 235 206
Income tax expense (4) (33) (33) (56)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent (6) 16 (55) (40)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent 61 59 431 162
Net income 55 75 376 122
Deferred Policy Acquisition Costs, Amortization Expense 0 0 0 0
Amortization of other intangible assets 0 0 0 0
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member] | Investment management and other fees        
Segment Reporting [Line Items]        
Insurance Commissions and Fees $ 11 $ 10 $ 32 $ 31