v3.26.1
Segment Information - Net Income From Segments to Consolidated (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Segment Reporting [Line Items]        
Earned premiums and fee income $ 6,365 $ 6,047 $ 12,597 $ 11,968
Insurance Commissions and Fees 86 86 173 172
Net Investment Income 800 658 1,534 1,310
Net realized gains (losses) 64 (19) 12 (68)
Other Income 34 30 61 52
Total revenues 7,263 6,716 14,204 13,262
Benefits, Losses and Expenses 6,032 5,542 11,982 11,364
Segment Reporting, Other Segment Item, Amount 25 21 43 38
Income tax expense 251 236 438 376
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent 980 938 1,784 1,522
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent 318 57 370 103
Net income 1,298 995 2,154 1,625
Deferred Policy Acquisition Costs, Amortization Expense 669 625 1,325 1,232
Amortization of other intangible assets 17 17 35 35
Operating Segments [Member]        
Segment Reporting [Line Items]        
Earned premiums and fee income 6,354 6,037 12,576 11,947
Net Investment Income 782 644 1,500 1,282
Net realized gains (losses) 26 (42) (9) (72)
Other Income 26 25 48 46
Total revenues 7,188 6,664 14,115 13,203
Benefits, Losses and Expenses 5,910 5,453 11,772 11,188
Segment Reporting, Other Segment Item, Amount 25 21 43 38
Income tax expense 255 240 467 399
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent 998 950 1,833 1,578
Net income 998 950 1,833 1,578
Deferred Policy Acquisition Costs, Amortization Expense 669 625 1,325 1,232
Amortization of other intangible assets 17 17 35 35
Operating Segments [Member] | P&C Business Insurance        
Segment Reporting [Line Items]        
Earned premiums and fee income 3,675 3,435 7,259 6,770
Net Investment Income 556 449 1,061 886
Net realized gains (losses) 12 (20) (7) (44)
Other Income 1 1 1 2
Total revenues 4,244 3,865 8,314 7,614
Benefits, Losses and Expenses 3,359 2,991 6,758 6,139
Segment Reporting, Other Segment Item, Amount 2 2 1 4
Income tax expense 179 176 315 298
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent 704 696 1,240 1,173
Net income 704 696 1,240 1,173
Deferred Policy Acquisition Costs, Amortization Expense 590 546 1,167 1,077
Amortization of other intangible assets 7 7 14 14
Operating Segments [Member] | P&C Personal Insurance        
Segment Reporting [Line Items]        
Earned premiums and fee income 912 939 1,827 1,846
Net Investment Income 67 58 129 115
Net realized gains (losses) 4 (4) 0 (6)
Other Income 25 24 47 44
Total revenues 1,008 1,017 2,003 1,999
Benefits, Losses and Expenses 822 884 1,624 1,846
Segment Reporting, Other Segment Item, Amount 23 19 42 34
Income tax expense 33 23 68 23
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent 130 91 269 96
Net income 130 91 269 96
Deferred Policy Acquisition Costs, Amortization Expense 70 70 141 138
Amortization of other intangible assets 0 0 1 1
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 42 37
Net realized gains (losses) 1 (2) 0 (2)
Other Income 0 0 0 0
Total revenues 23 17 42 35
Benefits, Losses and Expenses 2 2 (32) 4
Segment Reporting, Other Segment Item, Amount 0 0 0 0
Income tax expense 4 2 15 5
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent 17 13 59 26
Net income 17 13 59 26
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 1,767 1,663 3,490 3,331
Net Investment Income 137 118 268 244
Net realized gains (losses) 9 (16) (2) (20)
Other Income 0 0 0 0
Total revenues 1,913 1,765 3,756 3,555
Benefits, Losses and Expenses 1,727 1,576 3,422 3,199
Segment Reporting, Other Segment Item, Amount 0 0 0 0
Income tax expense 39 39 69 73
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent 147 150 265 283
Net income 147 150 265 283
Deferred Policy Acquisition Costs, Amortization Expense 9 9 17 17
Amortization of other intangible assets 10 10 20 20
Segment Reporting, Reconciling Item, Corporate Nonsegment [Member]        
Segment Reporting [Line Items]        
Net Investment Income 18 14 34 28
Net realized gains (losses) 38 23 21 4
Other Income 8 5 13 6
Total revenues 75 52 89 59
Benefits, Losses and Expenses 97 68 167 138
Income tax expense (4) (4) (29) (23)
Income (Loss) from Continuing Operations, Net of Tax, Attributable to Parent (18) (12) (49) (56)
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent 318 57 370 103
Net income 300 45 321 47
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 $ 21 $ 21