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Supplementary Insurance Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Supplementary Insurance Information, by Segment      
Deferred policy acquisition costs $ 1,242 $ 1,093 $ 1,013
Gross future policy benefits, losses, claims and expense losses 12,920 12,069 11,374
Gross unearned premium 4,813 4,119 3,689
Other policy claims and benefits payable 43 49 41
Earned premiums 8,889 7,958 7,225
Investment income, net of expenses 905 786 680
Benefits, claims losses and settlement expense 5,737 5,274 5,019
Amortization of deferred policy acquisition costs 1,641 1,450 1,330
Underwriting, acquisition and insurance expenses 1,016 934 832
Net written premiums 9,245 8,048 7,309
Commercial Insurance      
Supplementary Insurance Information, by Segment      
Deferred policy acquisition costs 431 387 372
Gross future policy benefits, losses, claims and expense losses 6,303 5,887 5,568
Gross unearned premium 2,311 2,111 2,021
Earned premiums 4,486 4,264 4,024
Benefits, claims losses and settlement expense 2,795 2,787 2,761
Amortization of deferred policy acquisition costs 853 808 769
Underwriting, acquisition and insurance expenses 531 505 460
Net written premiums 4,690 4,336 4,159
Personal Insurance      
Supplementary Insurance Information, by Segment      
Deferred policy acquisition costs 276 210 168
Gross future policy benefits, losses, claims and expense losses 1,209 990 916
Gross unearned premium 1,633 1,253 994
Earned premiums 2,623 2,044 1,689
Benefits, claims losses and settlement expense 1,795 1,442 1,166
Amortization of deferred policy acquisition costs 457 367 311
Underwriting, acquisition and insurance expenses 305 243 198
Net written premiums 2,999 2,302 1,831
Excess and Surplus Lines Insurance      
Supplementary Insurance Information, by Segment      
Deferred policy acquisition costs 50 43 37
Gross future policy benefits, losses, claims and expense losses 1,109 932 753
Gross unearned premium 321 273 236
Earned premiums 615 542 485
Benefits, claims losses and settlement expense 411 350 315
Amortization of deferred policy acquisition costs 102 89 79
Underwriting, acquisition and insurance expenses 65 52 45
Net written premiums 654 570 502
Reinsurance assumed and other non segment      
Supplementary Insurance Information, by Segment      
Deferred policy acquisition costs 129 109 105
Gross future policy benefits, losses, claims and expense losses 1,316 1,166 1,099
Gross unearned premium 547 481 437
Earned premiums 844 795 726
Benefits, claims losses and settlement expense 435 379 474
Amortization of deferred policy acquisition costs 199 157 144
Underwriting, acquisition and insurance expenses 52 76 72
Net written premiums 900 838 815
Property, Liability and Casualty Insurance      
Supplementary Insurance Information, by Segment      
Deferred policy acquisition costs 886 749 682
Gross future policy benefits, losses, claims and expense losses 9,937 8,975 8,336
Gross unearned premium 4,812 4,118 3,688
Earned premiums 8,568 7,645 6,924
Investment income, net of expenses 715 602 509
Benefits, claims losses and settlement expense 5,436 4,958 4,716
Amortization of deferred policy acquisition costs 1,611 1,421 1,303
Underwriting, acquisition and insurance expenses 953 876 775
Net written premiums 9,243 8,046 7,307
Accident and Health Insurance      
Supplementary Insurance Information, by Segment      
Net written premiums 2 2 2
Life Insurance Segment      
Supplementary Insurance Information, by Segment      
Deferred policy acquisition costs 356 344 331
Gross future policy benefits, losses, claims and expense losses 2,983 3,094 3,038
Gross unearned premium 1 1 1
Other policy claims and benefits payable 43 49 41
Earned premiums 321 313 301
Investment income, net of expenses 190 184 171
Benefits, claims losses and settlement expense 301 316 303
Amortization of deferred policy acquisition costs 30 29 27
Underwriting, acquisition and insurance expenses $ 63 $ 58 $ 57