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Supplementary Information Concerning Property Casualty Insurance Operations (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Property Casualty Insurance Underwriters |  |  |
Deferred policy acquisition costs | $ 749 | $ 682 | $ 602
Reserves for unpaid claims and claim adjustment expenses | 8,975 | 8,336 | 7,229
Unearned premiums | 4,118 | 3,688 | 3,270
Earned premiums | 7,645 | 6,924 | 6,184
Investment income | 602 | 509 | 457
Loss and loss expenses incurred related to current accident year | 5,173 | 4,875 | 4,024
Prior year claims and claims adjustments expense, (favorable) and unfavorable | (215) | (159) | (428)
Amortization of deferred policy acquisition cost | 1,421 | 1,303 | 1,151
Paid loss and loss expenses | 4,276 | 3,687 | 3,094
Net written premiums | 8,046 | 7,307 | 6,479
Commercial Insurance |  |  |
Property Casualty Insurance Underwriters |  |  |
Deferred policy acquisition costs | 387 | 372 | 345
Reserves for unpaid claims and claim adjustment expenses | 5,887 | 5,568 | 5,007
Unearned premiums | 2,111 | 2,021 | 1,857
Earned premiums | 4,264 | 4,024 | 3,674
Investment income | 0 | 0 | 0
Loss and loss expenses incurred related to current accident year | 2,910 | 2,837 | 2,293
Prior year claims and claims adjustments expense, (favorable) and unfavorable | (123) | (76) | (353)
Amortization of deferred policy acquisition cost | 808 | 769 | 703
Paid loss and loss expenses | 2,480 | 2,211 | 1,806
Net written premiums | 4,336 | 4,159 | 3,811
Personal Insurance |  |  |
Property Casualty Insurance Underwriters |  |  |
Deferred policy acquisition costs | 210 | 168 | 145
Reserves for unpaid claims and claim adjustment expenses | 990 | 916 | 814
Unearned premiums | 1,253 | 994 | 850
Earned premiums | 2,044 | 1,689 | 1,542
Investment income | 0 | 0 | 0
Loss and loss expenses incurred related to current accident year | 1,506 | 1,227 | 1,042
Prior year claims and claims adjustments expense, (favorable) and unfavorable | (64) | (61) | (50)
Amortization of deferred policy acquisition cost | 367 | 311 | 276
Paid loss and loss expenses | 1,353 | 1,071 | 914
Net written premiums | 2,302 | 1,831 | 1,594
Excess and Surplus Lines Insurance |  |  |
Property Casualty Insurance Underwriters |  |  |
Deferred policy acquisition costs | 43 | 37 | 33
Reserves for unpaid claims and claim adjustment expenses | 932 | 753 | 577
Unearned premiums | 273 | 236 | 207
Earned premiums | 542 | 485 | 398
Investment income | 0 | 0 | 0
Loss and loss expenses incurred related to current accident year | 361 | 324 | 243
Prior year claims and claims adjustments expense, (favorable) and unfavorable | (11) | (9) | 7
Amortization of deferred policy acquisition cost | 89 | 79 | 63
Paid loss and loss expenses | 183 | 145 | 118
Net written premiums | 570 | 502 | 426
Reinsurance assumed and other non segment |  |  |
Property Casualty Insurance Underwriters |  |  |
Deferred policy acquisition costs | 109 | 105 | 79
Reserves for unpaid claims and claim adjustment expenses | 1,166 | 1,099 | 831
Unearned premiums | 481 | 437 | 356
Earned premiums | 795 | 726 | 570
Investment income | 0 | 0 | 0
Loss and loss expenses incurred related to current accident year | 396 | 487 | 446
Prior year claims and claims adjustments expense, (favorable) and unfavorable | (17) | (13) | (32)
Amortization of deferred policy acquisition cost | 157 | 144 | 109
Paid loss and loss expenses | 260 | 260 | 256
Net written premiums | $ 838 | $ 815 | $ 648

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- Definition Amount of amortization expense on deferred policy acquisition cost for property-casualty insurance underwriter. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18(Column I)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480149/944-235-S99-3 + Details
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- Definition Amount, after effects of reinsurance, of expense for claims incurred in the current reporting period and related claims settlement costs. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 40 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480081/944-40-50-3 + Details
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