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Supplementary Information Concerning Property Casualty Insurance Operations (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Property Casualty Insurance Underwriters      
Deferred policy acquisition costs $ 886 $ 749 $ 682
Reserves for unpaid claims and claim adjustment expenses 9,937 8,975 8,336
Unearned premiums 4,812 4,118 3,688
Earned premiums 8,568 7,645 6,924
Investment income 715 602 509
Current accident year 5,672 5,173 4,875
Prior accident years (236) (215) (159)
Amortization of deferred policy acquisition cost 1,611 1,421 1,303
Paid loss and loss expenses 4,381 4,276 3,687
Net written premiums 9,243 8,046 7,307
Commercial Insurance      
Property Casualty Insurance Underwriters      
Deferred policy acquisition costs 431 387 372
Reserves for unpaid claims and claim adjustment expenses 6,303 5,887 5,568
Unearned premiums 2,311 2,111 2,021
Earned premiums 4,486 4,264 4,024
Investment income 0 0 0
Current accident year 2,933 2,910 2,837
Prior accident years (138) (123) (76)
Amortization of deferred policy acquisition cost 853 808 769
Paid loss and loss expenses 2,335 2,480 2,211
Net written premiums 4,690 4,336 4,159
Personal Insurance      
Property Casualty Insurance Underwriters      
Deferred policy acquisition costs 276 210 168
Reserves for unpaid claims and claim adjustment expenses 1,209 990 916
Unearned premiums 1,633 1,253 994
Earned premiums 2,623 2,044 1,689
Investment income 0 0 0
Current accident year 1,821 1,506 1,227
Prior accident years (26) (64) (61)
Amortization of deferred policy acquisition cost 457 367 311
Paid loss and loss expenses 1,565 1,353 1,071
Net written premiums 2,999 2,302 1,831
Excess and Surplus Lines Insurance      
Property Casualty Insurance Underwriters      
Deferred policy acquisition costs 50 43 37
Reserves for unpaid claims and claim adjustment expenses 1,109 932 753
Unearned premiums 321 273 236
Earned premiums 615 542 485
Investment income 0 0 0
Current accident year 403 361 324
Prior accident years 8 (11) (9)
Amortization of deferred policy acquisition cost 102 89 79
Paid loss and loss expenses 229 183 145
Net written premiums 654 570 502
Reinsurance assumed and other non segment      
Property Casualty Insurance Underwriters      
Deferred policy acquisition costs 129 109 105
Reserves for unpaid claims and claim adjustment expenses 1,316 1,166 1,099
Unearned premiums 547 481 437
Earned premiums 844 795 726
Investment income 0 0 0
Current accident year 515 396 487
Prior accident years (80) (17) (13)
Amortization of deferred policy acquisition cost 199 157 144
Paid loss and loss expenses 252 260 260
Net written premiums $ 900 $ 838 $ 815