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Supplementary Insurance Information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Supplementary Insurance Information, by Segment |  |  |
Deferred policy acquisition costs | $ 1,093 | $ 1,013 | $ 916
Gross future policy benefits, losses, claims and expense losses | 12,069 | 11,374 | 10,727
Gross unearned premium | 4,119 | 3,689 | 3,271
Other policy claims and benefits payable | 49 | 41 | 53
Earned premiums | 7,958 | 7,225 | 6,478
Investment income, net of expenses | 786 | 680 | 623
Benefits, claims losses and settlement expense | 5,274 | 5,019 | 3,909
Amortization of deferred policy acquisition costs | 1,450 | 1,330 | 1,176
Underwriting, acquisition and insurance expenses | 934 | 832 | 770
Net written premiums | 8,048 | 7,309 | 6,481
Commercial Insurance |  |  |
Supplementary Insurance Information, by Segment |  |  |
Deferred policy acquisition costs | 387 | 372 | 345
Gross future policy benefits, losses, claims and expense losses | 5,887 | 5,568 | 5,007
Gross unearned premium | 2,111 | 2,021 | 1,857
Earned premiums | 4,264 | 4,024 | 3,674
Benefits, claims losses and settlement expense | 2,787 | 2,761 | 1,940
Amortization of deferred policy acquisition costs | 808 | 769 | 703
Underwriting, acquisition and insurance expenses | 505 | 460 | 437
Net written premiums | 4,336 | 4,159 | 3,811
Personal Insurance |  |  |
Supplementary Insurance Information, by Segment |  |  |
Deferred policy acquisition costs | 210 | 168 | 145
Gross future policy benefits, losses, claims and expense losses | 990 | 916 | 814
Gross unearned premium | 1,253 | 994 | 850
Earned premiums | 2,044 | 1,689 | 1,542
Benefits, claims losses and settlement expense | 1,442 | 1,166 | 992
Amortization of deferred policy acquisition costs | 367 | 311 | 276
Underwriting, acquisition and insurance expenses | 243 | 198 | 181
Net written premiums | 2,302 | 1,831 | 1,594
Excess and Surplus Lines Insurance |  |  |
Supplementary Insurance Information, by Segment |  |  |
Deferred policy acquisition costs | 43 | 37 | 33
Gross future policy benefits, losses, claims and expense losses | 932 | 753 | 577
Gross unearned premium | 273 | 236 | 207
Earned premiums | 542 | 485 | 398
Benefits, claims losses and settlement expense | 350 | 315 | 250
Amortization of deferred policy acquisition costs | 89 | 79 | 63
Underwriting, acquisition and insurance expenses | 52 | 45 | 43
Net written premiums | 570 | 502 | 426
Reinsurance assumed and other non segment |  |  |
Supplementary Insurance Information, by Segment |  |  |
Deferred policy acquisition costs | 109 | 105 | 79
Gross future policy benefits, losses, claims and expense losses | 1,166 | 1,099 | 831
Gross unearned premium | 481 | 437 | 356
Earned premiums | 795 | 726 | 570
Benefits, claims losses and settlement expense | 379 | 474 | 414
Amortization of deferred policy acquisition costs | 157 | 144 | 109
Underwriting, acquisition and insurance expenses | 76 | 72 | 55
Net written premiums | 838 | 815 | 648
Property, Liability and Casualty Insurance |  |  |
Supplementary Insurance Information, by Segment |  |  |
Deferred policy acquisition costs | 749 | 682 | 602
Gross future policy benefits, losses, claims and expense losses | 8,975 | 8,336 | 7,229
Gross unearned premium | 4,118 | 3,688 | 3,270
Earned premiums | 7,645 | 6,924 | 6,184
Investment income, net of expenses | 602 | 509 | 457
Benefits, claims losses and settlement expense | 4,958 | 4,716 | 3,596
Amortization of deferred policy acquisition costs | 1,421 | 1,303 | 1,151
Underwriting, acquisition and insurance expenses | 876 | 775 | 716
Net written premiums | 8,046 | 7,307 | 6,479
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 | 344 | 331 | 314
Gross future policy benefits, losses, claims and expense losses | 3,094 | 3,038 | 3,498
Gross unearned premium | 1 | 1 | 1
Other policy claims and benefits payable | 49 | 41 | 53
Earned premiums | 313 | 301 | 294
Investment income, net of expenses | 184 | 171 | 166
Benefits, claims losses and settlement expense | 316 | 303 | 313
Amortization of deferred policy acquisition costs | 29 | 27 | 25
Underwriting, acquisition and insurance expenses | $ 58 | $ 57 | $ 54

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