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Schedule VI. Supplemental Information Concerning Property and Casualty Insurance Operations | 12 Months Ended
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Dec. 31, 2024
SEC Schedule, 12-18, Supplemental Information, Property-Casualty Insurance Underwriters [Abstract] |
Schedule VI. Supplemental Information Concerning Property and Casualty Insurance Operations | SCHEDULE VI. SUPPLEMENTAL INFORMATION CONCERNING PROPERTY AND CASUALTY INSURANCE OPERATIONS
As of and for the years ended December 31 | Consolidated Property and Casualty Operations
(In millions) | 2024 |  | 2023 |  | 2022
Balance Sheet Data |  |  |  |  |
Deferred acquisition costs | $ | 959 |  |  | $ | 896 |  |  |
Reserves for unpaid claim and claim adjustment expenses | 24,976 |  |  | 23,304 |  |  |
Discount deducted from claim and claim adjustment expense reserves above (based on interest rates ranging from 3.5% to 6.6%) | 615 |  |  | 647 |  |  |
Unearned premiums | 7,346 |  |  | 6,933 |  |  |
Statement of Operations Data |  |  |  |  |
Net written premiums | $ | 10,605 |  |  | $ | 9,892 |  |  | $ | 9,128 |
Net earned premiums | 10,211 |  |  | 9,480 |  |  | 8,667 |
Net investment income | 2,396 |  |  | 2,163 |  |  | 1,751 |
Incurred claim and claim adjustment expenses related to current year | 6,330 |  |  | 5,667 |  |  | 5,181 |
Incurred claim and claim adjustment expenses related to prior years | 42 |  |  | 48 |  |  | (32) |
Amortization of deferred acquisition costs | 1,798 |  |  | 1,644 |  |  | 1,490 |
Paid claim and claim adjustment expenses | 5,189 |  |  | 4,601 |  |  | 4,302 |

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- Definition The entire disclosure of supplemental information for registrant, its subsidiary and 50-percent-or-less-owned equity basis investee, with liability for property-casualty insurance claim. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 18 -Paragraph Column A -Subparagraph (c) -Footnote 3 -Publisher SEC Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 18 -Publisher SEC Reference 3: 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 A)(c)(Footnote 3)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477965/944-235-S99-3 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 235 -Name Accounting Standards Codification -Section S99 -Paragraph 3 -Subparagraph (SX 210.12-18) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477965/944-235-S99-3 + Details
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