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Insurance Liabilities | 12 Months Ended
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Dec. 31, 2024
Insurance [Abstract] |
Insurance Liabilities | 13. Insurance Liabilities LIABILITY FOR UNPAID LOSSES AND LOSS ADJUSTMENT EXPENSES (LOSS RESERVES) Loss reserves represent the accumulation of estimates of unpaid claims, including estimates for claims incurred but not reported and loss adjustment expenses, less applicable discount. We regularly review and update the methods used to determine loss reserve estimates. Any adjustments resulting from this review are reflected currently in pre-tax income, except to the extent such adjustment impacts a deferred gain under a retroactive reinsurance agreement, in which case the ceded portion would be amortized into pre-tax income in subsequent periods. Because these estimates are subject to the outcome of future events, changes in estimates are common given that loss trends vary and time is often required for changes in trends to be recognized and confirmed. Reserve changes that increase previous estimates of ultimate cost are referred to as unfavorable or adverse development or reserve strengthening. Reserve changes that decrease previous estimates of ultimate cost are referred to as favorable development or reserve releases. Our gross loss reserves before reinsurance and discount are net of contractual deductible recoverable amounts due from policyholders of approximately $12.1 billion at both December 31, 2024 and 2023. These recoverable amounts are related to certain policies with high deductibles (in excess of high dollar amounts retained by the insured through self-insured retentions, deductibles, retrospective programs, or captive arrangements, each referred to generically as “deductibles”), primarily for U.S. Commercial casualty business. With respect to the deductible portion of the claim, we manage and pay the entire claim on behalf of the insured and are reimbursed by the insured for the deductible portion of the claim. Thus, these recoverable amounts represent a credit exposure to us. At December 31, 2024 and 2023 we held collateral of approximately $8.6 billion and $8.7 billion, respectively, for these deductible recoverable amounts, consisting primarily of letters of credit and funded trust agreements. Allowance for credit losses for the unsecured portion of these recoverable amounts was $14 million at both December 31, 2024 and 2023. The following table presents the rollforward of activity in loss reserves:
Years Ended December 31, |  |  |  |  |  |  |  |  |  |  |
(in millions) |  |  |  |  |  |  | 2024 |  | 2023 |  | 2022
Liability for unpaid loss and loss adjustment expenses, beginning of year |  |  |  |  |  |  | $ | 70,393 |  |  | $ | 75,167 |  |  | $ | 79,026 |
Reinsurance recoverable |  |  |  |  |  |  | (30,289) |  |  | (32,102) |  |  | (35,213) |
Net Liability for unpaid loss and loss adjustment expenses, beginning of year |  |  |  |  |  |  | 40,104 |  |  | 43,065 |  |  | 43,813 |
Losses and loss adjustment expenses incurred: |  |  |  |  |  |  |  |  |  |  |
Current year |  |  |  |  |  |  | 14,363 |  |  | 15,100 |  |  | 16,434 |
Prior years, excluding discount and amortization of deferred gain |  |  |  |  |  |  | 254 |  |  | (392) |  |  | (530) |
Prior years, discount charge (benefit) |  |  |  |  |  |  | 354 |  |  | 307 |  |  | (605) |
Prior years, amortization of deferred gain on retroactive reinsurance(a) |  |  |  |  |  |  | (404) |  |  | (81) |  |  | (252) |
Total losses and loss adjustment expenses incurred |  |  |  |  |  |  | 14,567 |  |  | 14,934 |  |  | 15,047 |
Losses and loss adjustment expenses paid: |  |  |  |  |  |  |  |  |  |  |
Current year |  |  |  |  |  |  | (3,694) |  |  | (3,836) |  |  | (4,011) |
Prior years |  |  |  |  |  |  | (9,849) |  |  | (11,868) |  |  | (11,066) |
Total losses and loss adjustment expenses paid |  |  |  |  |  |  | (13,543) |  |  | (15,704) |  |  | (15,077) |
Other changes: |  |  |  |  |  |  |  |  |  |  |
Foreign exchange effect |  |  |  |  |  |  | (996) |  |  | 606 |  |  | (1,463) |
Losses and loss adjustment expenses recognized within gain on divestitures |  |  |  |  |  |  | — |  |  | 569 |  |  | — |
Retroactive reinsurance adjustment (net of discount)(b) |  |  |  |  |  |  | 15 |  |  | 158 |  |  | 745 |
Dispositions(c) |  |  |  |  |  |  | (5) |  |  | (3,505) |  |  | — |
Reclassified to held for sale, net of reinsurance recoverables |  |  |  |  |  |  | — |  |  | (19) |  |  | — |
Total other changes |  |  |  |  |  |  | (986) |  |  | (2,191) |  |  | (718) |
Liability for unpaid loss and loss adjustment expenses, end of year: |  |  |  |  |  |  |  |  |  |  |
Net liability for unpaid losses and loss adjustment expenses |  |  |  |  |  |  | 40,142 |  |  | 40,104 |  |  | 43,065 |
Reinsurance recoverable |  |  |  |  |  |  | 29,026 |  |  | 30,289 |  |  | 32,102 |
Total |  |  |  |  |  |  | $ | 69,168 |  |  | $ | 70,393 |  |  | $ | 75,167 |
(a)Includes $82 million, $33 million and $63 million for the retroactive reinsurance agreement with NICO covering U.S. asbestos exposures for the years ended December 31, 2024, 2023 and 2022, respectively. (b)Includes benefit (charge) from change in discount on retroactive reinsurance in the amount of $168 million, $150 million and $(301) million for the years ended December 31, 2024, 2023 and 2022, respectively. (c)Includes amounts related to the sale of Validus Re through the date of disposition. The following table presents the reconciliation of the net liability for unpaid losses and loss adjustment expenses in the following tables to Loss Reserves in the Consolidated Balance Sheets for the year ended December 31, 2024:
(in millions) | Net liability for unpaid losses and loss adjustment expenses as presented in the disaggregated tables below | Reinsurance recoverable on unpaid losses and loss adjustment expenses included in the disaggregated tables below | Gross liability for unpaid losses and loss adjustment expenses
U.S. Workers' Compensation (before discount) | $ | 3,468 | $ | 4,852 | $ | 8,320
U.S. Excess Casualty |  | 3,208 |  | 3,139 |  | 6,347
U.S. Other Casualty |  | 4,387 |  | 3,416 |  | 7,803
U.S. Financial Lines |  | 5,422 |  | 1,614 |  | 7,036
U.S. Property and Special Risks |  | 4,297 |  | 1,233 |  | 5,530
U.S. Personal Insurance |  | 836 |  | 2,048 |  | 2,884
UK/Europe Casualty and Financial lines |  | 7,280 |  | 1,952 |  | 9,232
UK/Europe Property and Special Risks |  | 2,355 |  | 1,761 |  | 4,116
UK/Europe and Japan Personal Insurance |  | 1,269 |  | 670 |  | 1,939
Total | $ | 32,522 | $ | 20,685 | $ | 53,207
Reconciling Items |  |  |  |  |  |
Discount on workers' compensation lines |  |  |  |  |  | (2,111)
Other product lines* |  |  |  |  |  | 15,384
Unallocated loss adjustment expenses |  |  |  |  |  | 2,688
Total Loss Reserves |  |  |  |  | $ | 69,168
*Reinsurance recoverable for other product lines of $8.4 billion resulted in a net liability for unpaid losses and loss adjustment expenses of $7.0 billion for the year ended December 31, 2024. Prior Year Development In the sections below, we provide details by coverage group regarding incurred losses, reserve balances and prior year development. The first table below shows prior year development by coverage group, the first two columns of which will again be presented in the coverage group sections that follow. After this table we describe historical drivers of prior year development as well as actuarial methods and relevant terminology. The following coverage group sections present the undiscounted incurred losses and allocated loss adjustment expenses by accident year on a net basis after reinsurance, with separate presentation of the adverse development cover where applicable, excluding related amortization of the deferred gain. Each section also contains a description of the business included in that section. Finally, we show a table of claims payout patterns by coverage. In 2017, we entered into adverse development reinsurance agreement (ADC) cessions with NICO under which we transferred to NICO 80 percent of the reserve risk on substantially all of our U.S. Commercial long-tail exposures for accident years 2015 and prior. The following table presents the reconciliation of net prior year development before the ADC cessions from the tables below to the net prior year development after ADC cessions and amortization of deferred gain for the year ended December 31, 2024:
(in millions) |  | Prior Year Development Net of External Reinsurance Before ADC Cessions |  | Prior Year Development Net of External Reinsurance After ADC Cessions(a) |  | Re-Attribution of ADC Recovery(b) |  | Amortization of Deferred Gain at Inception |  | Prior Year Development After Amortization and Re-attribution
U.S. Workers' Compensation | $ | (273) |  | $ | (205) |  | $ | (14) |  | $ | (42) |  | $ | (261) |
U.S. Excess Casualty |  | 545 |  |  | 238 |  |  | 22 |  |  | (32) |  |  | 228 |
U.S. Other Casualty |  | 12 |  |  | 44 |  |  | (38) |  |  | (31) |  |  | (25) |
U.S. Financial Lines |  | 51 |  |  | (40) |  |  | 20 |  |  | (23) |  |  | (43) |
U.S. Property and Special Risks |  | (44) |  |  | 4 |  |  | 11 |  |  | (7) |  |  | 8 |
U.S. Personal Insurance |  | (23) |  |  | (25) |  |  | (1) |  |  | (1) |  |  | (27) |
UK/Europe Casualty and Financial lines |  | 170 |  |  | 170 |  |  | — |  |  | — |  |  | 170 |
UK/Europe Property and Special Risks |  | (35) |  |  | (35) |  |  | — |  |  | — |  |  | (35) |
UK/Europe and Japan Personal Insurance |  | (47) |  |  | (47) |  |  | — |  |  | — |  |  | (47) |
Other Operations |  | 1 |  |  | 1 |  |  | — |  |  | — |  |  | 1 |
Other product lines |  | (299) |  |  | (336) |  |  | — |  |  | — |  |  | (336) |
Subtotal, adjusted pre-tax basis | $ | 58 |  | $ | (231) |  | $ | — |  | $ | (136) |  | $ | (367) |
Businesses in run-off |  | 196 |  |  | 111 |  |  | — |  |  | — |  |  | 111 |
Subtotal | $ | 254 |  | $ | (120) |  | $ | — |  | $ | (136) |  | $ | (256) |
Remove impact of Retroactive Reinsurance |  |  |  |  |  |  |  |  |  |
Amortization of deferred gain at inception |  |  |  |  |  |  |  |  |  | 136 |
Prior year development ceded under the Asbestos LPT |  |  |  |  |  |  |  |  |  | 85 |
Prior year development ceded under the ADC |  |  |  |  |  |  |  |  |  | 289 |
Total, prior years, excluding discount and amortization of deferred gain | $ | 254 |
(a)Change in net ultimate loss and loss adjustment expenses excludes the portion of prior year development we have ceded under the Asbestos Loss Portfolio Transfer (LPT) and the ADC, both of which are provided by NICO and are considered retroactive reinsurance under U.S. GAAP. (b)Reattribution of the ADC recovery takes place annually as we model the future payments on the subject reserves. ADC recoverables are then reallocated by line based on payments expected to be made. During 2024, we recognized unfavorable prior year loss reserve development of $254 million excluding discount and amortization of deferred gain. The development was primarily driven by: •Favorable development on U.S. Workers’ Compensation of $273 million, net of external reinsurance but before ADC cessions reflecting continued favorable loss experience; •Unfavorable development on U.S. Excess Casualty of $545 million, net of external reinsurance but before ADC cessions, driven by a large settlement of a legacy mass tort claim with the gross loss in accident years covered under the ADC and increased reserves related to claims emergence; •Unfavorable development on U.S Other Casualty of $12 million, net of external reinsurance but before ADC cessions, reflecting unfavorable development on Commercial Auto and Wholesale Primary General Liability, partially offset by favorability across numerous Casualty reserving classes; •Unfavorable development in U.S. Financial Lines of $51 million, net of external reinsurance but before ADC cessions, due to unfavorable development in M&A and High Excess classes, offset by favorable experience across most reserving classes; •Favorable development on U.S Property and Special Risks of $44 million, net of external reinsurance but before ADC cessions, reflecting favorable loss experience in Retail and Wholesale Property, offset by development on prior year catastrophes; •Favorable development in U.S. Personal Insurance of $23 million driven by favorable development on prior year catastrophes across several events primarily in the 2019-2023 accident years; •Unfavorable development in UK/Europe Casualty and Financial Lines of $170 million driven by unfavorable development in UK Financial Lines partially offset by favorable development in EMEA Financial Lines, and unfavorable development in European Excess Casualty driven by claim-specific emergence on accident year 2016; •Favorable development on UK/Europe Property and Special Risks of $35 million reflecting favorable development across most segments and geographies; •Favorable development on UK/Europe and Japan Personal Insurance of $47 million primarily driven by Japan A&H and Auto, partially offset by unfavorable Personal Auto in EMEA; •Favorable development of $299 million in total on other product lines, net of external reinsurance but before ADC cessions, primarily driven by Global Specialty which saw favorable development across multiple lines; and •Unfavorable development on Businesses in run-off of $196 million, net of external reinsurance but before ADC cessions, is primarily attributed to Asbestos development of $85 million, which is entirely ceded under the LPT, and development on the Blackboard insurance portfolio of $112 million due to increased reported loss activity in general liability. During 2023, we recognized favorable prior year loss reserve development of $392 million excluding discount and amortization of deferred gain. The development was primarily driven by: •Favorable development on U.S. Workers’ Compensation of $267 million, net of external reinsurance but before ADC cessions due to a continuation of favorable loss cost trends in guaranteed cost and excess segments across most accident years; •Favorable development on U.S. Excess Casualty of $32 million, net of external reinsurance but before ADC cessions, driven by favorable development on the Excess Construction Runoff Portfolio; •Favorable development on U.S Other Casualty of $133 million, net of external reinsurance but before ADC cessions, largely driven by favorable experience in construction defect and construction wraps as well as guaranteed cost auto and general liability; •Unfavorable development in U.S. Financial Lines of $94 million, net of external reinsurance but before ADC cessions, due to unfavorable development on High Attaching Excess Directors and Officers (D&O), M&A, Primary National D&O, Cyber data privacy claims, and Architects & Engineers, partially offset by favorable development on Primary Private Not for Profit D&O and Financial Institutions D&O; •Favorable development on U.S Property and Special Risks of $10 million, net of external reinsurance but before ADC cessions, reflecting favorable development on prior year catastrophes in the 2017-2021 accident years, offset by adverse development on prior year catastrophes in the 2022 accident year; •Favorable development in U.S. Personal Insurance of $64 million driven by favorable development on prior year catastrophes across several events primarily in the 2017-2020 accident years; •Unfavorable development in UK/Europe Casualty and Financial Lines of $165 million due to unfavorable development in auto liability in Europe and UK and in UK D&O and Commercial Professional Indemnity business, partially offset by favorable development in Financial Institutions Professional Indemnity and D&O in Europe and UK and Cyber and Commercial Professional Indemnity in Europe; •Unfavorable development on UK/Europe Property and Special Risks of $81 million driven by unfavorable development on prior year catastrophes; •Favorable development on UK/Europe and Japan Personal Insurance of $57 million driven by favorable development in Japan personal auto and A&H business; and •Favorable development of $162 million in total on other product lines, net of external reinsurance but before ADC cessions, driven by favorable development in global specialty and financial lines in Canada and other International regions. During 2022, we recognized favorable prior year loss reserve development of $530 million excluding discount and amortization of deferred gain. The development was primarily driven by: •Favorable development on U.S. Workers’ Compensation of $644 million, net of external reinsurance but before ADC cessions due to continued favorable frequency and severity trends across most accident years particularly for excess and guaranteed cost US Workers Compensation segments; •Favorable development on U.S. Excess Casualty of $116 million, net of external reinsurance but before ADC cessions, driven by lead and mid-excess Retail Excess Casualty; •Favorable development on U.S Other Casualty of $149 million, net of external reinsurance but before ADC cessions, largely driven by favorable experience in Commercial Auto, General Liability and Construction Wraps; •Unfavorable development in U.S. Financial Lines of $939 million, net of external reinsurance but before ADC cessions, due to higher severity trends particularly in Excess & Primary D&O and Excess & Financial Institutions Errors and Omissions (E&O). This was partially offset by favorable development in Employment Practices Liability Insurance (EPLI); •Favorable development in U.S. Property and Special Risks of $81 million driven by more favorable crop experience than anticipated; •Unfavorable development in UK/Europe Casualty and Financial Lines of $82 million due to unfavorable experience in UK Financial Lines in M&A, Commercial PI and Commercial D&O as well as unfavorable Casualty experience due to large loss activity in the UK, European Excess Casualty, and French Auto experience; •Favorable development on UK/Europe Property and Special Risks of $153 million driven by Global Specialty, primarily from accident years 2020 and 2021. This favorable experience was seen in each product line and in every region; •Favorable development on UK/Europe and Japan Personal Insurance of $111 million driven by Japan Auto and A&H business with additional favorable experience in UK and Europe; and •Favorable development of $264 million in total on other product lines, net of external reinsurance but before ADC cessions, driven by runoff construction business and favorable results from our Canadian business across most products. Our analyses and conclusions about prior year reserves also help inform our judgments about the current accident year loss and loss adjustment expense ratios we selected. Loss Development Information The following is information about incurred and paid loss developments as of December 31, 2024, net of reinsurance. The cumulative number of reported claims, the total of IBNR liabilities and expected development on reported loss included within the net incurred loss amounts are presented in the following section. Reserving Methodology We use a combination of methods to project ultimate losses for both long-tail and short-tail exposures, which include: •Paid Development method: The Paid Development method estimates ultimate losses by reviewing paid loss patterns and selecting paid ultimate loss development factors. These factors are then applied to paid losses by applying them to accident years, with further expected changes in paid loss. Since the method does not rely on case reserves, it is not directly influenced by changes in the adequacy of case reserves. •Incurred Development method: The Incurred Development method is similar to the Paid Development method, but it uses case incurred losses instead of paid losses. Since this method uses more data (case reserves in addition to paid losses) than the Paid Development method, the incurred development patterns may be less variable than paid development patterns. •Expected Loss Ratio method: The Expected Loss Ratio method multiplies premiums by an expected loss ratio to produce ultimate loss estimates for each accident year. This method may be useful if loss development patterns are inconsistent, losses emerge very slowly, or there is relatively little loss history from which to estimate future losses. Expected loss ratio methods for business written in excess of a deductible may be given significant weight in the most recent five accident years. The expected loss ratios used for recent accident years are based on the projected ultimate loss ratios for older years adjusted for rate changes, loss trend including inflation, and where appropriate, changing market conditions. •Bornhuetter-Ferguson method: The Bornhuetter-Ferguson method using premiums and paid losses is a combination of the Paid Development method and the Expected Loss Ratio method where the weight given to each method is the reciprocal of the loss development factor. This method normally determines expected loss ratios similar to the method used for the Expected Loss Ratio method. The Bornhuetter-Ferguson method using premiums and incurred losses is similar to the Bornhuetter-Ferguson method using premiums and paid losses except that it uses case-incurred losses. •Cape Cod method: The Cape Cod method is mechanically similar to the Bornhuetter-Ferguson method with the difference being that the Expected Loss Ratio estimates are determined based on a weighting of the loss estimates that come from the Paid/Incurred Development Methods. This method may be more responsive to recent loss trends than the Bornhuetter-Ferguson method. •Average Loss method: The Average Loss method multiplies a projected number of ultimate claims by an estimated ultimate severity average loss for each accident year to produce ultimate loss estimates. Since projections of the ultimate number of claims are often less variable than projections of ultimate loss, this method can provide more reliable results for reserve categories where loss development patterns are inconsistent or too variable to be relied on exclusively. In updating our loss reserve estimates, we consider and evaluate inputs from many sources, including actual claims data, the performance of prior reserve estimates, observed industry trends, our internal peer review processes, including challenges and recommendations from our Enterprise Risk Management group, as well as the views of third-party actuarial firms. We use these inputs to improve our evaluation techniques, and to analyze and assess the change in estimated ultimate loss for each accident year by product line. Our analyses produce a range of indications from various methods, from which we select our best estimate. In determining the actual carried loss reserves, we consider both the internal actuarial best estimate and numerous other internal and external factors, including: •an assessment of economic conditions, including real GDP growth, inflation, employment rates or unemployment duration, stock market volatility and changes in corporate bond spreads; •changes in the legal, regulatory, judicial and social environment, including changes in road safety, public health and cleanup standards; •changes in medical cost trends (inflation, intensity and utilization of medical services) and wage inflation trends; •underlying policy pricing, terms and conditions including attachment points and policy limits; •change in claims handling philosophy, operating model, processes, and related ongoing enhancements; •third-party claims reviews that are periodically performed for key classes of claims such as toxic tort, environmental and other complex casualty claims; •third-party actuarial reviews that are periodically performed for key classes of business; •input from underwriters on pricing, terms, and conditions and market trends; and •changes in our reinsurance program, pricing and commutations. Where appropriate and identifiable, adjustments have been made to standard projection techniques. Changes in Claims organization management, differing referral and review criteria and other factors may also be expected to alter loss emergence. The following factors are relevant to the loss development information included in the tables below: •Table organization: The tables are organized by accident year and include policies written on an occurrence and claims- made basis. We note that for certain categories of claims (e.g., construction defect claims and environmental claims) and for reinsurance recoverable, losses may sometimes be reclassified to an earlier or later accident year as more information about the date of occurrence becomes available to us. These reclassifications are shown as development in the respective years in the tables below. Financial Lines business is primarily written on a claims-made basis, while the majority of the workers’ compensation, excess casualty, other casualty, and run-off property and casualty lines of business are written on an occurrence basis. Primarily, all short-tail lines in Property and Special Risks and Personal Insurance are written on an occurrence basis. •Groupings: We believe our groupings have homogenous risk characteristics with similar development patterns and would generally be subject to similar trends and reflect our reportable segments. The incurred losses and loss adjustment expenses and paid losses in the following tables for the current reporting year are allocated to the line of business and accident years based on how the business is coded by profit center and line of business. •Reinsurance: Our reinsurance program varies by exposure type. Historically we have leveraged facultative and treaty reinsurance, both on a pro-rata and excess of loss basis. Our reinsurance program may change from year to year, which may affect the comparability of the data presented in our tables. •Adverse development reinsurance agreement: We have provided the impact of the ADC in an additional table below our Incurred Losses and Allocated Loss Adjustment Expenses tables. The impact of the ADC is shown beginning in 2016 given the retroactive date of the contract and coincides with the effective date of the contract. For the lines of business covered by the agreement (U.S. Workers' Compensation, U.S. Excess Casualty, U.S. Other Casualty, U.S. Financial Lines, U.S. Property and Special Risks and U.S. Personal Insurance or collectively, the Covered Lines), an attribution of the loss recoveries to the line of business by calendar year and accident year is performed based on the underlying distribution of the losses subject to the agreement. Specifically, the future claim payments for all subject incurred losses were projected into future years based on the same actuarial assumptions underlying the related reserves. The additional table presented after discussion of prior year development by line of business reconciles the changes in net ultimates to our overall prior year development and provides the reattribution of loss recoveries for the Covered Lines. The reinsurance terms of the ADC were then used to identify the future claims payments for which 80% will be reimbursed by NICO. At each reporting period, the attribution of the ADC recoveries is performed. The factors that could cause the attribution to lines of business and accident year to change include changes in underlying actuarial assumptions as to timing and amount of future claim payments. •Incurred but not reported liabilities (IBNR): We include development from past reported losses in IBNR. •Data excluded from tables: Information with respect to accident years older than ten years is excluded from the development tables. Unallocated loss adjustment expenses are also excluded. •Foreign exchange: The loss development for operations outside of the U.S. is presented for all accident years using the current exchange rate at December 31, 2024. Although this approach requires restating all prior accident year information, the changes in exchange rates do not impact incurred and paid loss development trends. •Acquisitions: We include acquisitions from all accident years presented in the tables. For purposes of this disclosure, we have applied the retrospective method for the acquired reserves, including incurred and paid claim development histories throughout the relevant tables. It should be noted that historical reserves for the acquired businesses were established by the acquired companies using methods, assumptions and procedures then in effect which may differ from our current reserving bases. Accordingly, it may not be appropriate to extrapolate future redundancies or deficiencies based on the aggregated historical results shown in the triangles. •Dispositions: We exclude dispositions from all accident years presented in the tables. •Claim counts: We consider a reported claim to be one claim for each claimant or feature for each loss occurrence. Claims relating to losses that are 100 percent reinsured are excluded from the reported claims in the tables below. Reported claims for losses from assumed reinsurance contracts are not available and hence not included in the reported claims. There are limitations that should be considered on the reported claim count data in the tables below, including: –Claim counts are presented only on a reported (not an ultimate) basis; –The tables below include lines of business and geographies at a certain aggregated level which may indicate different frequency and severity trends and characteristics, and may not be as meaningful as the claim count information related to the individual products within those lines of business and geographies; –Certain lines of business are more likely to be subject to occurrences involving multiple claimants and features, which can distort measures based on the reported claim counts in the table below; and –Reported claim counts are not adjusted for ceded reinsurance, which may distort the measure of frequency or severity. Supplemental Information: The information about incurred and paid loss development for all periods preceding the year ended December 31, 2024 and the related historical claims payout percentage disclosure is unaudited and is presented as supplementary information. The following tables present undiscounted, incurred and paid losses and allocated loss adjustment expenses by accident year, on a net basis after reinsurance, with a separate presentation of the ADC excluding the related amortization of the deferred gain: U.S. Workers' Compensation U.S. Workers’ Compensation is an extremely long-tail line of business, with loss emergence extending for decades. We generally use a combination of loss development, frequency/severity and expected loss ratio methods for workers’ compensation. Many of our workers compensation policies contain risk-sharing features, including high deductibles, self-insured retentions or retrospective rating features, in addition to a traditional insurance component. These risk-sharing programs generally are large and complex, comprising multiple products, years and structures, and are subject to amendment over time. We group guaranteed cost and excess of deductible business separately and then further by state and industry subset to the extent that meaningful differences are determined to exist. We also separately analyze certain subsets of the portfolio that have unique characteristics (e.g., U.S. government sub-contractor accounts and construction wrap-up business). For excess of deductible business, we also segment by size of deductible and whether the claim is handled by AIG or an outside third-party administrator. The proportion of large deductible business has increased over time, which has slowed the reporting pattern of claims. Incurred Losses and Allocated Loss Adjustment Expenses, Undiscounted and Net of Reinsurance
| Years Ended December 31, (in millions) |  | December 31, 2024 |  |  |  |
Accident Year | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2024 Prior Year Development Excluding the Impact of ADC | Total of IBNR Liabilities Plus Expected Development on Reported Losses | Cumulative Number of Reported Claims | Incurred Impact of ADC | IBNR Impact of ADC | 2024 (Net of Impact of ADC) | Total of IBNR Liabilities Net of Impact of ADC
| Unaudited |  |  |  |  |  |  |  |
2015 | $ | 1,708 |  | $ | 1,864 |  | $ | 1,866 |  | $ | 1,814 |  | $ | 1,722 |  | $ | 1,675 |  | $ | 1,634 |  | $ | 1,612 |  | $ | 1,592 |  | $ | 1,464 |  | $ | (128) |  | $ | 179 |  | 37,763 |  | $ | (317) |  | $ | (144) |  | $ | 1,147 |  | $ | 35 |
2016 |  | 1,299 |  | 1,346 |  | 1,318 |  | 1,140 |  | 1,090 |  | 1,075 |  | 1,036 |  | 1,025 |  | 986 |  | (39) |  | 178 |  | 32,178 |  | — |  | — |  | 986 |  | 178 |
2017 |  |  | 789 |  | 850 |  | 776 |  | 763 |  | 731 |  | 712 |  | 705 |  | 673 |  | (32) |  | 176 |  | 28,057 |  | — |  | — |  | 673 |  | 176 |
2018 |  |  |  | 998 |  | 1,021 |  | 961 |  | 911 |  | 896 |  | 875 |  | 786 |  | (89) |  | 200 |  | 22,484 |  | — |  | — |  | 786 |  | 200 |
2019 |  |  |  |  | 887 |  | 873 |  | 812 |  | 801 |  | 788 |  | 730 |  | (58) |  | 218 |  | 17,292 |  | — |  | — |  | 730 |  | 218 |
2020 |  |  |  |  |  | 597 |  | 573 |  | 521 |  | 477 |  | 434 |  | (43) |  | 104 |  | 14,124 |  | — |  | — |  | 434 |  | 104 |
2021 |  |  |  |  |  |  | 597 |  | 570 |  | 545 |  | 514 |  | (31) |  | 212 |  | 11,293 |  | — |  | — |  | 514 |  | 212 |
2022 |  |  |  |  |  |  |  | 523 |  | 493 |  | 464 |  | (29) |  | 209 |  | 9,829 |  | — |  | — |  | 464 |  | 209 |
2023 |  |  |  |  |  |  |  |  | 500 |  | 465 |  | (35) |  | 273 |  | 8,954 |  | — |  | — |  | 465 |  | 273 |
2024 |  |  |  |  |  |  |  |  |  | 567 |  |  | 455 |  | 6,285 |  | — |  | — |  | 567 |  | 455 |
Total |  |  |  |  |  |  |  |  |  | $ | 7,083 |  | $ | (484) |  |  |  | $ | (317) |  |  | $ | 6,766 |  |
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below |  | (3,806) |  | — |  |  |  | 71 |  |  | (3,735) |  |
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2015, net of reinsurance |  | 4,145 |  | (187) |  |  |  | (3,708) |  |  | 437 |  |
Unallocated loss adjustment expense prior year development |  |  | 398 |  |  |  |  |  |  |
Liabilities for losses and loss adjustment expenses and prior year loss development, net of reinsurance |  | $ | 7,422 |  | $ | (273) |  |  |  | $ | (3,954) |  |  | $ | 3,468 |  |
Incurred Losses and Loss Adjustment Expenses, Undiscounted, Net of Reinsurance (including impact of ADC)
|  | Calendar Years Ended December 31, (in millions) |
Accident Year |  | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | Prior Year Development
|  | Unaudited |  |
2015 |  | $ | 1,279 | $ | 1,279 | $ | 1,318 | $ | 1,134 | $ | 1,105 | $ | 1,041 | $ | 1,092 | $ | 1,154 | $ | 1,147 |  | $ | (7) |
2016 |  | 1,299 | 1,346 | 1,318 | 1,140 | 1,090 | 1,075 | 1,036 | 1,025 | 986 |  | (39) |
2017 |  |  | 789 | 850 | 776 | 763 | 731 | 712 | 705 | 673 |  | (32) |
2018 |  |  |  | 998 | 1,021 | 961 | 911 | 896 | 875 | 786 |  | (89) |
2019 |  |  |  |  | 887 | 873 | 812 | 801 | 788 | 730 |  | (58) |
2020 |  |  |  |  |  | 597 | 573 | 521 | 477 | 434 |  | (43) |
2021 |  |  |  |  |  |  | 597 | 570 | 545 | 514 |  | (31) |
2022 |  |  |  |  |  |  |  | 523 | 493 | 464 |  | (29) |
2023 |  |  |  |  |  |  |  |  | 500 | 465 |  | (35) |
2024 |  |  |  |  |  |  |  |  |  | 567 |  |
Total |  | $ | 2,578 |  | $ | 3,414 |  | $ | 4,484 |  | $ | 4,958 |  | $ | 5,389 |  | $ | 5,740 |  | $ | 6,151 |  | $ | 6,562 |  | $ | 6,766 |  | $ | (363) |
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below | (3,735) |  |
Liabilities for losses and allocated loss adjustment expenses and prior year development before 2015, net of reinsurance | 437 |  | (26) |
Unallocated loss adjustment expense prior year adjustment |  | 184 |
Liabilities for losses and loss adjustment expenses and prior year loss development, net of reinsurance | $ | 3,468 |  | $ | (205) |
The following table provides our attribution of our reinsurance recoverable for the ADC only (included in the table above):
|  | Calendar Years Ended December 31, (in millions) |
Accident Year |  | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | Prior Year Development
|  | Unaudited |  |
2015 |  | $ | (585) |  | $ | (587) |  | $ | (496) |  | $ | (588) |  | $ | (570) |  | $ | (593) |  | $ | (520) |  | $ | (438) |  | $ | (317) |  | $ | 121 |
2016 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2017 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2018 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2019 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2020 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2021 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2022 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2023 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2024 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
Total |  | $ | (585) |  | $ | (587) |  | $ | (496) |  | $ | (588) |  | $ | (570) |  | $ | (593) |  | $ | (520) |  | $ | (438) |  | $ | (317) |  | $ | 121 |
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below | 71 |  |
Liabilities for losses and allocated loss adjustment expenses and prior year development before 2015, net of reinsurance | (3,708) |  | 161 |
Unallocated loss adjustment expense prior year development |  | (214) |
Liabilities for losses and loss adjustment expenses and prior year loss development, net of reinsurance | $ | (3,954) |  | $ | 68 |
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance
| Years Ended December 31, (in millions) |  | Paid Impact of ADC
Accident Year | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
| Unaudited |  |  |
2015 | $ | 234 |  | $ | 524 |  | $ | 725 |  | $ | 854 |  | $ | 925 |  | $ | 979 |  | $ | 1,013 |  | $ | 1,038 |  | $ | 1,058 |  | $ | 1,080 |  |  | $ | (71) |
2016 |  | 147 |  | 378 |  | 521 |  | 584 |  | 630 |  | 662 |  | 686 |  | 694 |  | 708 |  |  | — |
2017 |  |  | 93 |  | 224 |  | 294 |  | 333 |  | 367 |  | 389 |  | 395 |  | 402 |  |  | — |
2018 |  |  |  | 85 |  | 215 |  | 296 |  | 359 |  | 388 |  | 409 |  | 448 |  |  | — |
2019 |  |  |  |  | 93 |  | 219 |  | 301 |  | 347 |  | 389 |  | 417 |  |  | — |
2020 |  |  |  |  |  | 64 |  | 159 |  | 205 |  | 245 |  | 259 |  |  | — |
2021 |  |  |  |  |  |  | 60 |  | 128 |  | 171 |  | 211 |  |  | — |
2022 |  |  |  |  |  |  |  | 45 |  | 102 |  | 143 |  |  | — |
2023 |  |  |  |  |  |  |  |  | 38 |  | 103 |  |  | — |
2024 |  |  |  |  |  |  |  |  |  | 35 |  |  | — |
Total |  |  |  |  |  |  |  |  |  | $ | 3,806 |  |  | $ | (71) |
U.S. Excess Casualty U.S. Excess Casualty policies tend to attach at a high layer above underlying policies, which causes the loss development pattern to lag significantly. Many of the claims notified to the excess layers are closed without payment because the claims never reach our layer as a result of high deductibles and other underlying coverages, while the claims that reach our layer can have large case reserves or settlements and be highly variable in terms of reported timing and amount. For a portion of this business, the underlying primary policies are issued by other insurance companies, which can limit our access to relevant information to help inform our judgments as the loss events evolve and mature. Furthermore, this coverage is often significantly impacted by the underwriting cycle and external judicial trends. Recent accident years reflect a strategy towards having higher attachment points on the portfolio through changing participations in various layers within an insured’s program. Incurred Losses and Allocated Loss Adjustment Expenses, Undiscounted and Net of Reinsurance
| Years Ended December 31, (in millions) |  | December 31, 2024 |  |  |  |
Accident Year | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2024 Prior Year Development Excluding the Impact of ADC | Total of IBNR Liabilities Plus Expected Development on Reported Losses | Cumulative Number of Reported Claims | Incurred Impact of ADC | IBNR Impact of ADC | 2024 (Net of Impact of ADC) | Total of IBNR Liabilities Net of Impact of ADC
| Unaudited |  |  |  |  |  |  |  |
2015 | $ | 989 |  | $ | 1,463 |  | $ | 1,440 |  | $ | 1,603 |  | $ | 1,656 |  | $ | 1,694 |  | $ | 1,721 |  | $ | 1,686 |  | $ | 1,658 |  | $ | 1,723 |  | $ | 65 |  | $ | 258 |  | 3,269 |  | $ | (534) |  | $ | (131) |  | $ | 1,189 |  | $ | 127 |
2016 |  | 898 |  | 1,146 |  | 1,162 |  | 1,171 |  | 1,274 |  | 1,250 |  | 1,263 |  | 1,276 |  | 1,317 |  | 41 |  | 343 |  | 2,970 |  | — |  | — |  | 1,317 |  | 343 |
2017 |  |  | 856 |  | 1,002 |  | 1,097 |  | 1,153 |  | 1,157 |  | 1,200 |  | 1,182 |  | 1,228 |  | 46 |  | 227 |  | 2,252 |  | — |  | — |  | 1,228 |  | 227 |
2018 |  |  |  | 648 |  | 646 |  | 721 |  | 769 |  | 769 |  | 779 |  | 779 |  | — |  | 149 |  | 1,613 |  | — |  | — |  | 779 |  | 149 |
2019 |  |  |  |  | 577 |  | 583 |  | 597 |  | 612 |  | 600 |  | 604 |  | 4 |  | 279 |  | 1,469 |  | — |  | — |  | 604 |  | 279 |
2020 |  |  |  |  |  | 406 |  | 413 |  | 410 |  | 420 |  | 404 |  | (16) |  | 194 |  | 1,438 |  | — |  | — |  | 404 |  | 194 |
2021 |  |  |  |  |  |  | 278 |  | 277 |  | 274 |  | 358 |  | 84 |  | 154 |  | 1,039 |  | — |  | — |  | 358 |  | 154 |
2022 |  |  |  |  |  |  |  | 305 |  | 305 |  | 333 |  | 28 |  | 156 |  | 690 |  | — |  | — |  | 333 |  | 156 |
2023 |  |  |  |  |  |  |  |  | 345 |  | 348 |  | 3 |  | 210 |  | 567 |  | — |  | — |  | 348 |  | 210 |
2024 |  |  |  |  |  |  |  |  |  | 315 |  |  | 302 |  | 235 |  | — |  | — |  | 315 |  | 302 |
Total |  |  |  |  |  |  |  |  |  | $ | 7,409 |  | $ | 255 |  |  |  | $ | (534) |  |  | $ | 6,875 |  |
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below |  | (4,350) |  | — |  |  |  | 197 |  |  | (4,153) |  |
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2015, net of reinsurance |  | 2,104 |  | 217 |  |  |  | (1,618) |  |  | 486 |  |
Unallocated loss adjustment expense prior year development |  |  | 73 |  |  |  |  |  |  |
Liabilities for losses and loss adjustment expenses and prior year loss development, net of reinsurance |  | $ | 5,163 |  | $ | 545 |  |  |  | $ | (1,955) |  |  | $ | 3,208 |  |
Incurred Losses and Loss Adjustment Expenses, Undiscounted, Net of Reinsurance (including impact of ADC)
|  | Calendar Years Ended December 31, (in millions) |
Accident Year |  | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | Prior Year Development
|  | Unaudited |  |
2015 |  | $ | 1,027 | $ | 1,015 | $ | 1,139 | $ | 1,163 | $ | 1,211 | $ | 1,231 | $ | 1,174 | $ | 1,196 | $ | 1,189 |  | $ | (7) |
2016 |  | 898 | 1,146 | 1,162 | 1,171 | 1,274 | 1,250 | 1,263 | 1,276 | 1,317 |  | 41 |
2017 |  |  | 856 | 1,002 | 1,097 | 1,153 | 1,157 | 1,200 | 1,182 | 1,228 |  | 46 |
2018 |  |  |  | 648 | 646 | 721 | 769 | 769 | 779 | 779 |  | — |
2019 |  |  |  |  | 577 | 583 | 597 | 612 | 600 | 604 |  | 4 |
2020 |  |  |  |  |  | 406 | 413 | 410 | 420 | 404 |  | (16) |
2021 |  |  |  |  |  |  | 278 | 277 | 274 | 358 |  | 84 |
2022 |  |  |  |  |  |  |  | 305 | 305 | 333 |  | 28 |
2023 |  |  |  |  |  |  |  |  | 345 | 348 |  | 3 |
2024 |  |  |  |  |  |  |  |  |  | 315 |  |
Total |  | $ | 1,925 |  | $ | 3,017 |  | $ | 3,951 |  | $ | 4,654 |  | $ | 5,348 |  | $ | 5,695 |  | $ | 6,010 |  | $ | 6,377 |  | $ | 6,875 |  | $ | 183 |
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below | (4,153) |  |
Liabilities for losses and allocated loss adjustment expenses and prior year development before 2015, net of reinsurance | 486 |  | 39 |
Unallocated loss adjustment expense prior year adjustment |  | 16 |
Liabilities for losses and loss adjustment expenses and prior year loss development, net of reinsurance | $ | 3,208 |  | $ | 238 |
The following table provides our attribution of our reinsurance recoverable for the ADC only (included in the table above):
|  | Calendar Years Ended December 31, (in millions) |
Accident Year |  | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | Prior Year Development
|  | Unaudited |  |
2015 |  | $ | (436) |  | $ | (425) |  | $ | (464) |  | $ | (493) |  | $ | (483) |  | $ | (490) |  | $ | (512) |  | $ | (462) |  | $ | (534) |  | $ | (72) |
2016 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2017 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2018 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2019 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2020 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2021 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2022 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2023 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2024 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
Total |  | $ | (436) |  | $ | (425) |  | $ | (464) |  | $ | (493) |  | $ | (483) |  | $ | (490) |  | $ | (512) |  | $ | (462) |  | $ | (534) |  | $ | (72) |
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below | 197 |  |
Liabilities for losses and allocated loss adjustment expenses and prior year development before 2015, net of reinsurance | (1,618) |  | (178) |
Unallocated loss adjustment expense prior year development |  | (57) |
Liabilities for losses and loss adjustment expenses and prior year loss development, net of reinsurance | $ | (1,955) |  | $ | (307) |
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance
| Years Ended December 31, (in millions) |  | Paid Impact of ADC
Accident Year | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
| Unaudited |  |  |
2015 | $ | 9 |  | $ | 210 |  | $ | 391 |  | $ | 718 |  | $ | 935 |  | $ | 1,061 |  | $ | 1,124 |  | $ | 1,253 |  | $ | 1,291 |  | $ | 1,325 |  |  | $ | (197) |
2016 |  | 28 |  | 80 |  | 204 |  | 388 |  | 502 |  | 566 |  | 670 |  | 798 |  | 851 |  |  | — |
2017 |  |  | 1 |  | 45 |  | 156 |  | 505 |  | 585 |  | 676 |  | 781 |  | 860 |  |  | — |
2018 |  |  |  | 1 |  | 125 |  | 227 |  | 315 |  | 414 |  | 494 |  | 527 |  |  | — |
2019 |  |  |  |  | 7 |  | 43 |  | 79 |  | 157 |  | 216 |  | 253 |  |  | — |
2020 |  |  |  |  |  | 4 |  | 15 |  | 33 |  | 128 |  | 188 |  |  | — |
2021 |  |  |  |  |  |  | 4 |  | 43 |  | 62 |  | 161 |  |  | — |
2022 |  |  |  |  |  |  |  | 14 |  | 51 |  | 96 |  |  | — |
2023 |  |  |  |  |  |  |  |  | 1 |  | 89 |  |  | — |
2024 |  |  |  |  |  |  |  |  |  | — |  |  | — |
Total |  |  |  |  |  |  |  |  |  | $ | 4,350 |  |  | $ | (197) |
U.S. Other Casualty U.S. Other Casualty includes general liability, automobile liability, environmental, medical malpractice, and other casualty lines of business. These lines of business are all long-tail in nature and while somewhat diverse in terms of exposures, these lines are often subject to similar trends. These lines are often significantly impacted by the underwriting cycle and external judicial trends. Many of our policies contain risk-sharing features, including high deductibles, self-insured retentions or retrospective rating features, in addition to a traditional insurance component. These risk-sharing programs generally are large and complex, comprising multiple products, years and structures, and are subject to amendment over time. Incurred Losses and Allocated Loss Adjustment Expenses, Undiscounted and Net of Reinsurance
| Years Ended December 31, (in millions) |  | December 31, 2024 |  |  |  |
Accident Year | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2024 Prior Year Development Excluding the Impact of ADC | Total of IBNR Liabilities Plus Expected Development on Reported Losses | Cumulative Number of Reported Claims | Incurred Impact of ADC | IBNR Impact of ADC | 2024 (Net of Impact of ADC) | Total of IBNR Liabilities Net of Impact of ADC
| Unaudited |  |  |  |  |  |  |  |
2015 | $ | 1,329 |  | $ | 1,762 |  | $ | 1,829 |  | $ | 1,736 |  | $ | 1,794 |  | $ | 1,834 |  | $ | 1,824 |  | $ | 1,815 |  | $ | 1,796 |  | $ | 1,770 |  | $ | (26) |  | $ | 6 |  | 35,881 |  | $ | (273) |  | $ | (3) |  | $ | 1,497 |  | $ | 3 |
2016 |  | 1,339 |  | 1,343 |  | 1,321 |  | 1,391 |  | 1,340 |  | 1,323 |  | 1,293 |  | 1,297 |  | 1,264 |  | (33) |  | 69 |  | 29,391 |  | — |  | — |  | 1,264 |  | 69 |
2017 |  |  | 602 |  | 629 |  | 738 |  | 674 |  | 668 |  | 643 |  | 654 |  | 662 |  | 8 |  | 14 |  | 21,382 |  | — |  | — |  | 662 |  | 14 |
2018 |  |  |  | 802 |  | 845 |  | 837 |  | 870 |  | 824 |  | 810 |  | 841 |  | 31 |  | 154 |  | 17,096 |  | — |  | — |  | 841 |  | 154 |
2019 |  |  |  |  | 1,059 |  | 1,058 |  | 1,053 |  | 1,062 |  | 1,039 |  | 1,024 |  | (15) |  | 469 |  | 21,383 |  | — |  | — |  | 1,024 |  | 469 |
2020 |  |  |  |  |  | 524 |  | 576 |  | 538 |  | 540 |  | 519 |  | (21) |  | 223 |  | 11,622 |  | — |  | — |  | 519 |  | 223 |
2021 |  |  |  |  |  |  | 795 |  | 793 |  | 790 |  | 818 |  | 28 |  | 470 |  | 11,249 |  | — |  | — |  | 818 |  | 470 |
2022 |  |  |  |  |  |  |  | 793 |  | 819 |  | 827 |  | 8 |  | 530 |  | 13,636 |  | — |  | — |  | 827 |  | 530 |
2023 |  |  |  |  |  |  |  |  | 933 |  | 955 |  | 22 |  | 781 |  | 13,687 |  | — |  | — |  | 955 |  | 781 |
2024 |  |  |  |  |  |  |  |  |  | 840 |  |  | 754 |  | 9,070 |  | — |  | — |  | 840 |  | 754 |
Total |  |  |  |  |  |  |  |  |  | $ | 9,520 |  | $ | 2 |  |  |  | $ | (273) |  |  | $ | 9,247 |  |
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below |  | (5,435) |  | — |  |  |  | 194 |  |  | (5,241) |  |
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2015, net of reinsurance |  | 1,300 |  | (14) |  |  |  | (919) |  |  | 381 |  |
Unallocated loss adjustment expense prior year development |  |  | 24 |  |  |  |  |  |  |
Liabilities for losses and loss adjustment expenses and prior year loss development, net of reinsurance |  | $ | 5,385 |  | $ | 12 |  |  |  | $ | (998) |  |  | $ | 4,387 |  |
Incurred Losses and Loss Adjustment Expenses, Undiscounted, Net of Reinsurance (including impact of ADC)
|  | Calendar Years Ended December 31, (in millions) |
Accident Year |  | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | Prior Year Development
|  | Unaudited |  |
2015 |  | $ | 1,361 | $ | 1,373 | $ | 1,423 | $ | 1,493 | $ | 1,553 | $ | 1,562 | $ | 1,563 | $ | 1,514 | $ | 1,497 |  | $ | (17) |
2016 |  | 1,339 | 1,343 | 1,321 | 1,391 | 1,340 | 1,323 | 1,293 | 1,297 | 1,264 |  | (33) |
2017 |  |  | 602 | 629 | 738 | 674 | 668 | 643 | 654 | 662 |  | 8 |
2018 |  |  |  | 802 | 845 | 837 | 870 | 824 | 810 | 841 |  | 31 |
2019 |  |  |  |  | 1,059 | 1,058 | 1,053 | 1,062 | 1,039 | 1,024 |  | (15) |
2020 |  |  |  |  |  | 524 | 576 | 538 | 540 | 519 |  | (21) |
2021 |  |  |  |  |  |  | 795 | 793 | 790 | 818 |  | 28 |
2022 |  |  |  |  |  |  |  | 793 | 819 | 827 |  | 8 |
2023 |  |  |  |  |  |  |  |  | 933 | 955 |  | 22 |
2024 |  |  |  |  |  |  |  |  |  | 840 |  |
Total |  | $ | 2,700 |  | $ | 3,318 |  | $ | 4,175 |  | $ | 5,526 |  | $ | 5,986 |  | $ | 6,847 |  | $ | 7,509 |  | $ | 8,396 |  | $ | 9,247 |  | $ | 11 |
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below | (5,241) |  |
Liabilities for losses and allocated loss adjustment expenses and prior year development before 2015, net of reinsurance | 381 |  | 37 |
Unallocated loss adjustment expense prior year adjustment |  | (4) |
Liabilities for losses and loss adjustment expenses and prior year loss development, net of reinsurance | $ | 4,387 |  | $ | 44 |
The following table provides our attribution of our reinsurance recoverable for the ADC only (included in the table above):
|  | Calendar Years Ended December 31, (in millions) |
Accident Year |  | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | Prior Year Development
|  | Unaudited |  |
2015 |  | $ | (401) |  | $ | (456) |  | $ | (313) |  | $ | (301) |  | $ | (281) |  | $ | (262) |  | $ | (252) |  | $ | (282) |  | $ | (273) |  | $ | 9 |
2016 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2017 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2018 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2019 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2020 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2021 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2022 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2023 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2024 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
Total |  | $ | (401) |  | $ | (456) |  | $ | (313) |  | $ | (301) |  | $ | (281) |  | $ | (262) |  | $ | (252) |  | $ | (282) |  | $ | (273) |  | $ | 9 |
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below | 194 |  |
Liabilities for losses and allocated loss adjustment expenses and prior year development before 2015, net of reinsurance | (919) |  | 51 |
Unallocated loss adjustment expense prior year development |  | (28) |
Liabilities for losses and loss adjustment expenses and prior year loss development, net of reinsurance | $ | (998) |  | $ | 32 |
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance
| Years Ended December 31, (in millions) |  | Paid Impact of ADC
Accident Year | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
| Unaudited |  |  |
2015 | $ | 105 |  | $ | 309 |  | $ | 769 |  | $ | 1,087 |  | $ | 1,351 |  | $ | 1,485 |  | $ | 1,603 |  | $ | 1,680 |  | $ | 1,707 |  | $ | 1,717 |  |  | $ | (194) |
2016 |  | 77 |  | 298 |  | 489 |  | 703 |  | 846 |  | 938 |  | 1,018 |  | 1,074 |  | 1,144 |  |  | — |
2017 |  |  | 51 |  | 111 |  | 216 |  | 314 |  | 455 |  | 527 |  | 592 |  | 613 |  |  | — |
2018 |  |  |  | 43 |  | 122 |  | 227 |  | 360 |  | 470 |  | 565 |  | 636 |  |  | — |
2019 |  |  |  |  | 53 |  | 138 |  | 226 |  | 321 |  | 410 |  | 474 |  |  | — |
2020 |  |  |  |  |  | 26 |  | 73 |  | 139 |  | 198 |  | 252 |  |  | — |
2021 |  |  |  |  |  |  | 32 |  | 87 |  | 169 |  | 265 |  |  | — |
2022 |  |  |  |  |  |  |  | 38 |  | 112 |  | 195 |  |  | — |
2023 |  |  |  |  |  |  |  |  | 36 |  | 102 |  |  | — |
2024 |  |  |  |  |  |  |  |  |  | 37 |  |  | — |
Total |  |  |  |  |  |  |  |  |  | $ | 5,435 |  |  | $ | (194) |
U.S. Financial Lines U.S. Financial Lines business includes D&O, E&O, EPLI policies and various professional liability subsets of business, as well as the fidelity book of business. This includes cyber coverage and mergers and acquisitions coverage, which have been a growing and evolving portion of this portfolio. These product lines are predominantly claims-made in nature, losses are characterized by low frequency and high severity, and results are often significantly impacted by external economic conditions. Our analysis is segmented by major coverages, such as D&O, E&O, etc. and then further segmented by major industry groups (e.g. corporate accounts, national accounts, financial institutions, private/not-for-profit, etc.). We also separately review primary business from excess business for certain product lines. Incurred Losses and Allocated Loss Adjustment Expenses, Undiscounted and Net of Reinsurance
| Years Ended December 31, (in millions) |  | December 31, 2024 |  |  |  |
Accident Year | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2024 Prior Year Development Excluding the Impact of ADC | Total of IBNR Liabilities Plus Expected Development on Reported Losses | Cumulative Number of Reported Claims | Incurred Impact of ADC | IBNR Impact of ADC | 2024 (Net of Impact of ADC) | Total of IBNR Liabilities Net of Impact of ADC
| Unaudited |  |  |  |  |  |  |  |
2015 | $ | 1,737 |  | $ | 1,762 |  | $ | 1,743 |  | $ | 1,788 |  | $ | 1,830 |  | $ | 1,874 |  | $ | 1,959 |  | $ | 2,044 |  | $ | 2,048 |  | $ | 2,039 |  | $ | (9) |  | $ | 63 |  | 16,263 |  | $ | (485) |  | $ | (50) |  | $ | 1,554 |  | $ | 13 |
2016 |  | 1,605 |  | 1,855 |  | 1,993 |  | 2,064 |  | 2,139 |  | 2,281 |  | 2,325 |  | 2,308 |  | 2,322 |  | 14 |  | 112 |  | 16,138 |  | — |  | — |  | 2,322 |  | 112 |
2017 |  |  | 1,564 |  | 1,675 |  | 1,756 |  | 1,846 |  | 1,898 |  | 1,987 |  | 1,957 |  | 1,969 |  | 12 |  | 121 |  | 15,287 |  | — |  | — |  | 1,969 |  | 121 |
2018 |  |  |  | 1,640 |  | 1,766 |  | 1,882 |  | 2,063 |  | 2,225 |  | 2,322 |  | 2,282 |  | (40) |  | 354 |  | 14,857 |  | — |  | — |  | 2,282 |  | 354 |
2019 |  |  |  |  | 1,503 |  | 1,536 |  | 1,627 |  | 1,926 |  | 1,912 |  | 1,945 |  | 33 |  | 358 |  | 13,381 |  | — |  | — |  | 1,945 |  | 358 |
2020 |  |  |  |  |  | 1,213 |  | 1,252 |  | 1,408 |  | 1,457 |  | 1,470 |  | 13 |  | 260 |  | 10,461 |  | — |  | — |  | 1,470 |  | 260 |
2021 |  |  |  |  |  |  | 1,430 |  | 1,408 |  | 1,388 |  | 1,316 |  | (72) |  | 700 |  | 7,226 |  | — |  | — |  | 1,316 |  | 700 |
2022 |  |  |  |  |  |  |  | 1,130 |  | 1,108 |  | 1,105 |  | (3) |  | 857 |  | 5,939 |  | — |  | — |  | 1,105 |  | 857 |
2023 |  |  |  |  |  |  |  |  | 1,043 |  | 1,041 |  | (2) |  | 800 |  | 6,997 |  | — |  | — |  | 1,041 |  | 800 |
2024 |  |  |  |  |  |  |  |  |  | 942 |  |  | 851 |  | 7,258 |  | — |  | — |  | 942 |  | 851 |
Total |  |  |  |  |  |  |  |  |  | $ | 16,431 |  | $ | (54) |  |  |  | $ | (485) |  |  | $ | 15,946 |  |
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below |  | (10,922) |  | — |  |  |  | 367 |  |  | (10,555) |  |
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2015, net of reinsurance |  | 427 |  | 92 |  |  |  | (396) |  |  | 31 |  |
Unallocated loss adjustment expense prior year development |  |  | 13 |  |  |  |  |  |  |
Liabilities for losses and loss adjustment expenses and prior year loss development, net of reinsurance |  | $ | 5,936 |  | $ | 51 |  |  |  | $ | (514) |  |  | $ | 5,422 |  |
Incurred Losses and Loss Adjustment Expenses, Undiscounted, Net of Reinsurance (including impact of ADC)
|  | Calendar Years Ended December 31, (in millions) |
Accident Year |  | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | Prior Year Development
|  | Unaudited |  |
2015 |  | $ | 1,429 | $ | 1,430 | $ | 1,462 | $ | 1,552 | $ | 1,550 | $ | 1,595 | $ | 1,605 | $ | 1,553 | $ | 1,554 |  | $ | 1 |
2016 |  | 1,605 | 1,855 | 1,993 | 2,064 | 2,139 | 2,281 | 2,325 | 2,308 | 2,322 |  | 14 |
2017 |  |  | 1,564 | 1,675 | 1,756 | 1,846 | 1,898 | 1,987 | 1,957 | 1,969 |  | 12 |
2018 |  |  |  | 1,640 | 1,766 | 1,882 | 2,063 | 2,225 | 2,322 | 2,282 |  | (40) |
2019 |  |  |  |  | 1,503 | 1,536 | 1,627 | 1,926 | 1,912 | 1,945 |  | 33 |
2020 |  |  |  |  |  | 1,213 | 1,252 | 1,408 | 1,457 | 1,470 |  | 13 |
2021 |  |  |  |  |  |  | 1,430 | 1,408 | 1,388 | 1,316 |  | (72) |
2022 |  |  |  |  |  |  |  | 1,130 | 1,108 | 1,105 |  | (3) |
2023 |  |  |  |  |  |  |  |  | 1,043 | 1,041 |  | (2) |
2024 |  |  |  |  |  |  |  |  |  | 942 |  |
Total |  | $ | 3,034 |  | $ | 4,849 |  | $ | 6,770 |  | $ | 8,641 |  | $ | 10,166 |  | $ | 12,146 |  | $ | 14,014 |  | $ | 15,048 |  | $ | 15,946 |  | $ | (44) |
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below | (10,555) |  |
Liabilities for losses and allocated loss adjustment expenses and prior year development before 2015, net of reinsurance | 31 |  | 4 |
Unallocated loss adjustment expense prior year adjustment |  | — |
Liabilities for losses and loss adjustment expenses and prior year loss development, net of reinsurance | $ | 5,422 |  | $ | (40) |
The following table provides our attribution of our reinsurance recoverable for the ADC only (included in the table above):
|  | Calendar Years Ended December 31, (in millions) |
Accident Year |  | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | Prior Year Development
|  | Unaudited |  |
2015 |  | $ | (333) |  | $ | (313) |  | $ | (326) |  | $ | (278) |  | $ | (324) |  | $ | (364) |  | $ | (439) |  | $ | (495) |  | $ | (485) |  | $ | 10 |
2016 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2017 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2018 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2019 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2020 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2021 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2022 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2023 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2024 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
Total |  | $ | (333) |  | $ | (313) |  | $ | (326) |  | $ | (278) |  | $ | (324) |  | $ | (364) |  | $ | (439) |  | $ | (495) |  | $ | (485) |  | $ | 10 |
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below | 367 |  |
Liabilities for losses and allocated loss adjustment expenses and prior year development before 2015, net of reinsurance | (396) |  | (88) |
Unallocated loss adjustment expense prior year development |  | (13) |
Liabilities for losses and loss adjustment expenses and prior year loss development, net of reinsurance | $ | (514) |  | $ | (91) |
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance
| Years Ended December 31, (in millions) |  | Paid Impact of ADC
Accident Year | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
| Unaudited |  |  |
2015 | $ | 63 |  | $ | 390 |  | $ | 791 |  | $ | 1,055 |  | $ | 1,282 |  | $ | 1,488 |  | $ | 1,686 |  | $ | 1,818 |  | $ | 1,914 |  | $ | 1,929 |  |  | $ | (367) |
2016 |  | 73 |  | 499 |  | 1,002 |  | 1,358 |  | 1,659 |  | 1,826 |  | 1,903 |  | 2,039 |  | 2,115 |  |  | — |
2017 |  |  | 64 |  | 391 |  | 761 |  | 1,118 |  | 1,396 |  | 1,515 |  | 1,653 |  | 1,777 |  |  | — |
2018 |  |  |  | 86 |  | 486 |  | 835 |  | 1,126 |  | 1,415 |  | 1,601 |  | 1,776 |  |  | — |
2019 |  |  |  |  | 94 |  | 367 |  | 642 |  | 953 |  | 1,204 |  | 1,423 |  |  | — |
2020 |  |  |  |  |  | 84 |  | 356 |  | 648 |  | 915 |  | 1,063 |  |  | — |
2021 |  |  |  |  |  |  | 43 |  | 151 |  | 315 |  | 468 |  |  | — |
2022 |  |  |  |  |  |  |  | 30 |  | 109 |  | 177 |  |  | — |
2023 |  |  |  |  |  |  |  |  | 46 |  | 150 |  |  | — |
2024 |  |  |  |  |  |  |  |  |  | 44 |  |  | — |
Total |  |  |  |  |  |  |  |  |  | $ | 10,922 |  |  | $ | (367) |
U.S. Property and Special Risks U.S. Property products include commercial, industrial and energy-related property insurance products and services that cover exposures to manmade and natural disasters, including business interruption. U.S. Special Risk products include aerospace, environmental, political risk, trade credit, surety and marine insurance, and program business for various small and medium sized enterprises insurance lines. The program segments include both property and casualty exposures. Recent years have seen an increasing proportion of non-admitted coverages which has altered the underlying customer profile to be less severe in the aggregate. Incurred Losses and Allocated Loss Adjustment Expenses, Undiscounted and Net of Reinsurance
| Years Ended December 31, (in millions) |  | December 31, 2024 |  |  |  |
Accident Year | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2024 Prior Year Development Excluding the Impact of ADC | Total of IBNR Liabilities Plus Expected Development on Reported Losses | Cumulative Number of Reported Claims | Incurred Impact of ADC | IBNR Impact of ADC | 2024 (Net of Impact of ADC) | Total of IBNR Liabilities Net of Impact of ADC
| Unaudited |  |  |  |  |  |  |  |
2015 | $ | 2,567 |  | $ | 2,506 |  | $ | 2,489 |  | $ | 2,492 |  | $ | 2,466 |  | $ | 2,471 |  | $ | 2,479 |  | $ | 2,490 |  | $ | 2,493 |  | $ | 2,484 |  | $ | (9) |  | $ | 4 |  | 59,598 |  | $ | (97) |  | $ | (3) |  | $ | 2,387 |  | $ | 1 |
2016 |  | 2,674 |  | 2,748 |  | 2,690 |  | 2,697 |  | 2,707 |  | 2,694 |  | 2,700 |  | 2,713 |  | 2,727 |  | 14 |  | 8 |  | 54,893 |  | — |  | — |  | 2,727 |  | 8 |
2017 |  |  | 4,569 |  | 4,239 |  | 4,127 |  | 4,153 |  | 4,173 |  | 4,212 |  | 4,175 |  | 4,187 |  | 12 |  | 12 |  | 79,846 |  | — |  | — |  | 4,187 |  | 12 |
2018 |  |  |  | 2,978 |  | 2,993 |  | 2,992 |  | 3,229 |  | 3,201 |  | 3,210 |  | 3,204 |  | (6) |  | 49 |  | 70,122 |  | — |  | — |  | 3,204 |  | 49 |
2019 |  |  |  |  | 2,177 |  | 2,146 |  | 2,211 |  | 2,222 |  | 2,177 |  | 2,198 |  | 21 |  | 34 |  | 78,995 |  | — |  | — |  | 2,198 |  | 34 |
2020 |  |  |  |  |  | 3,391 |  | 3,320 |  | 3,280 |  | 3,238 |  | 3,269 |  | 31 |  | 645 |  | 68,891 |  | — |  | — |  | 3,269 |  | 645 |
2021 |  |  |  |  |  |  | 2,339 |  | 2,213 |  | 2,160 |  | 2,190 |  | 30 |  | 122 |  | 82,226 |  | — |  | — |  | 2,190 |  | 122 |
2022 |  |  |  |  |  |  |  | 3,171 |  | 3,281 |  | 3,240 |  | (41) |  | 504 |  | 86,499 |  | — |  | — |  | 3,240 |  | 504 |
2023 |  |  |  |  |  |  |  |  | 2,528 |  | 2,440 |  | (88) |  | 431 |  | 99,114 |  | — |  | — |  | 2,440 |  | 431 |
2024 |  |  |  |  |  |  |  |  |  | 1,844 |  |  | 537 |  | 25,410 |  | — |  | — |  | 1,844 |  | 537 |
Total |  |  |  |  |  |  |  |  |  | $ | 27,783 |  | $ | (36) |  |  |  | $ | (97) |  |  | $ | 27,686 |  |
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below |  | (23,702) |  | — |  |  |  | 70 |  |  | (23,632) |  |
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2015, net of reinsurance |  | 395 |  | (8) |  |  |  | (152) |  |  | 243 |  |
Unallocated loss adjustment expense prior year development |  |  | — |  |  |  |  |  |  |
Liabilities for losses and loss adjustment expenses and prior year loss development, net of reinsurance |  | $ | 4,476 |  | $ | (44) |  |  |  | $ | (179) |  |  | $ | 4,297 |  |
Incurred Losses and Loss Adjustment Expenses, Undiscounted, Net of Reinsurance (including impact of ADC)
|  | Calendar Years Ended December 31, (in millions) |
Accident Year |  | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | Prior Year Development
|  | Unaudited |  |
2015 |  | $ | 2,365 | $ | 2,391 | $ | 2,405 | $ | 2,372 | $ | 2,372 | $ | 2,372 | $ | 2,375 | $ | 2,393 | $ | 2,387 |  | $ | (6) |
2016 |  | 2,674 | 2,748 | 2,690 | 2,697 | 2,707 | 2,694 | 2,700 | 2,713 | 2,727 |  | 14 |
2017 |  |  | 4,569 | 4,239 | 4,127 | 4,153 | 4,173 | 4,212 | 4,175 | 4,187 |  | 12 |
2018 |  |  |  | 2,978 | 2,993 | 2,992 | 3,229 | 3,201 | 3,210 | 3,204 |  | (6) |
2019 |  |  |  |  | 2,177 | 2,146 | 2,211 | 2,222 | 2,177 | 2,198 |  | 21 |
2020 |  |  |  |  |  | 3,391 | 3,320 | 3,280 | 3,238 | 3,269 |  | 31 |
2021 |  |  |  |  |  |  | 2,339 | 2,213 | 2,160 | 2,190 |  | 30 |
2022 |  |  |  |  |  |  |  | 3,171 | 3,281 | 3,240 |  | (41) |
2023 |  |  |  |  |  |  |  |  | 2,528 | 2,440 |  | (88) |
2024 |  |  |  |  |  |  |  |  |  | 1,844 |  |
Total |  | $ | 5,039 |  | $ | 9,708 |  | $ | 12,312 |  | $ | 14,366 |  | $ | 17,761 |  | $ | 20,338 |  | $ | 23,374 |  | $ | 25,875 |  | $ | 27,686 |  | $ | (33) |
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below | (23,632) |  |
Liabilities for losses and allocated loss adjustment expenses and prior year development before 2015, net of reinsurance | 243 |  | 38 |
Unallocated loss adjustment expense prior year adjustment |  | (1) |
Liabilities for losses and loss adjustment expenses and prior year loss development, net of reinsurance | $ | 4,297 |  | $ | 4 |
The following table provides our attribution of our reinsurance recoverable for the ADC only (included in the table above):
|  | Calendar Years Ended December 31, (in millions) |
Accident Year |  | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | Prior Year Development
|  | Unaudited |  |
2015 |  | $ | (141) |  | $ | (98) |  | $ | (87) |  | $ | (94) |  | $ | (99) |  | $ | (107) |  | $ | (115) |  | $ | (100) |  | $ | (97) |  | $ | 3 |
2016 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2017 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2018 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2019 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2020 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2021 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2022 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2023 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2024 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
Total |  | $ | (141) |  | $ | (98) |  | $ | (87) |  | $ | (94) |  | $ | (99) |  | $ | (107) |  | $ | (115) |  | $ | (100) |  | $ | (97) |  | $ | 3 |
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below | 70 |  |
Liabilities for losses and allocated loss adjustment expenses and prior year development before 2015, net of reinsurance | (152) |  | 46 |
Unallocated loss adjustment expense prior year development |  | (1) |
Liabilities for losses and loss adjustment expenses and prior year loss development, net of reinsurance | $ | (179) |  | $ | 48 |
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance
| Years Ended December 31, (in millions) |  | Paid Impact of ADC
Accident Year | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
| Unaudited |  |  |
2015 | $ | 844 |  | $ | 1,572 |  | $ | 1,878 |  | $ | 2,121 |  | $ | 2,240 |  | $ | 2,308 |  | $ | 2,344 |  | $ | 2,391 |  | $ | 2,457 |  | $ | 2,462 |  |  | $ | (70) |
2016 |  | 821 |  | 1,747 |  | 2,076 |  | 2,296 |  | 2,464 |  | 2,539 |  | 2,616 |  | 2,647 |  | 2,679 |  |  | — |
2017 |  |  | 1,137 |  | 2,625 |  | 3,281 |  | 3,638 |  | 3,897 |  | 3,999 |  | 4,055 |  | 4,129 |  |  | — |
2018 |  |  |  | 977 |  | 2,162 |  | 2,509 |  | 2,715 |  | 2,863 |  | 2,994 |  | 3,094 |  |  | — |
2019 |  |  |  |  | 1,039 |  | 1,673 |  | 1,906 |  | 2,037 |  | 2,083 |  | 2,124 |  |  | — |
2020 |  |  |  |  |  | 844 |  | 1,613 |  | 1,874 |  | 2,190 |  | 2,414 |  |  | — |
2021 |  |  |  |  |  |  | 878 |  | 1,743 |  | 1,983 |  | 2,004 |  |  | — |
2022 |  |  |  |  |  |  |  | 1,208 |  | 2,207 |  | 2,437 |  |  | — |
2023 |  |  |  |  |  |  |  |  | 1,173 |  | 1,692 |  |  | — |
2024 |  |  |  |  |  |  |  |  |  | 667 |  |  | — |
Total |  |  |  |  |  |  |  |  |  | $ | 23,702 |  |  | $ | (70) |
U.S. Personal Insurance U.S. Personal Insurance consists of accident and health and personal lines. Accident and health products include voluntary and sponsor-paid personal accident and supplemental health products for individuals, employees, associations and other organizations as well as a broad range of travel insurance products and services for leisure and business travelers. Personal lines include automobile and homeowners’ insurance, extended warranty, and consumer specialty products, such as identity theft and credit card protection. Personal lines also provides insurance for high net worth individuals offered through AIG Private Client Group, including auto, homeowners, umbrella, yacht, fine art and collections insurance. Personal lines are generally short-tail in nature and can reflect significant salvage and subrogation recoveries. Incurred Losses and Allocated Loss Adjustment Expenses, Undiscounted and Net of Reinsurance
| Years Ended December 31, (in millions) |  | December 31, 2024 |  |  |  |
Accident Year | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2024 Prior Year Development Excluding the Impact of ADC | Total of IBNR Liabilities Plus Expected Development on Reported Losses | Cumulative Number of Reported Claims | Incurred Impact of ADC | IBNR Impact of ADC | 2024 (Net of Impact of ADC) | Total of IBNR Liabilities Net of Impact of ADC
| Unaudited |  |  |  |  |  |  |  |
2015 | $ | 1,511 |  | $ | 1,498 |  | $ | 1,494 |  | $ | 1,483 |  | $ | 1,482 |  | $ | 1,485 |  | $ | 1,487 |  | $ | 1,488 |  | $ | 1,487 |  | $ | 1,488 |  | $ | 1 |  | $ | 12 |  | 261,309 |  | $ | (9) |  | $ | — |  | $ | 1,479 |  | $ | 12 |
2016 |  | 1,536 |  | 1,533 |  | 1,533 |  | 1,540 |  | 1,542 |  | 1,544 |  | 1,544 |  | 1,541 |  | 1,541 |  | — |  | 16 |  | 247,696 |  | — |  | — |  | 1,541 |  | 16 |
2017 |  |  | 1,878 |  | 2,137 |  | 2,011 |  | 2,057 |  | 1,924 |  | 1,916 |  | 1,896 |  | 1,899 |  | 3 |  | 15 |  | 220,270 |  | — |  | — |  | 1,899 |  | 15 |
2018 |  |  |  | 2,188 |  | 2,193 |  | 2,154 |  | 1,937 |  | 1,936 |  | 1,920 |  | 1,927 |  | 7 |  | 37 |  | 102,483 |  | — |  | — |  | 1,927 |  | 37 |
2019 |  |  |  |  | 1,593 |  | 1,664 |  | 1,646 |  | 1,596 |  | 1,578 |  | 1,569 |  | (9) |  | 44 |  | 93,909 |  | — |  | — |  | 1,569 |  | 44 |
2020 |  |  |  |  |  | 954 |  | 906 |  | 913 |  | 894 |  | 890 |  | (4) |  | 33 |  | 55,713 |  | — |  | — |  | 890 |  | 33 |
2021 |  |  |  |  |  |  | 748 |  | 765 |  | 762 |  | 752 |  | (10) |  | 73 |  | 57,288 |  | — |  | — |  | 752 |  | 73 |
2022 |  |  |  |  |  |  |  | 517 |  | 529 |  | 525 |  | (4) |  | 100 |  | 55,394 |  | — |  | — |  | 525 |  | 100 |
2023 |  |  |  |  |  |  |  |  | 677 |  | 668 |  | (9) |  | 122 |  | 47,201 |  | — |  | — |  | 668 |  | 122 |
2024 |  |  |  |  |  |  |  |  |  | 604 |  |  | 294 |  | 29,007 |  | — |  | — |  | 604 |  | 294 |
Total |  |  |  |  |  |  |  |  |  | $ | 11,863 |  | $ | (25) |  |  |  | $ | (9) |  |  | $ | 11,854 |  |
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below |  | (10,979) |  | — |  |  |  | 9 |  |  | (10,970) |  |
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2015, net of reinsurance |  | (48) |  | 3 |  |  |  | — |  |  | (48) |  |
Unallocated loss adjustment expense prior year development |  |  | (1) |  |  |  |  |  |  |
Liabilities for losses and loss adjustment expenses and prior year loss development, net of reinsurance |  | $ | 836 |  | $ | (23) |  |  |  | $ | — |  |  | $ | 836 |  |
Incurred Losses and Loss Adjustment Expenses, Undiscounted, Net of Reinsurance (including impact of ADC)
|  | Calendar Years Ended December 31, (in millions) |
Accident Year |  | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | Prior Year Development
|  | Unaudited |  |
2015 |  | $ | 1,476 | $ | 1,475 | $ | 1,472 | $ | 1,476 | $ | 1,480 | $ | 1,482 | $ | 1,481 | $ | 1,479 | $ | 1,479 |  | $ | — |
2016 |  | 1,536 | 1,533 | 1,533 | 1,540 | 1,542 | 1,544 | 1,544 | 1,541 | 1,541 |  | — |
2017 |  |  | 1,878 | 2,137 | 2,011 | 2,057 | 1,924 | 1,916 | 1,896 | 1,899 |  | 3 |
2018 |  |  |  | 2,188 | 2,193 | 2,154 | 1,937 | 1,936 | 1,920 | 1,927 |  | 7 |
2019 |  |  |  |  | 1,593 | 1,664 | 1,646 | 1,596 | 1,578 | 1,569 |  | (9) |
2020 |  |  |  |  |  | 954 | 906 | 913 | 894 | 890 |  | (4) |
2021 |  |  |  |  |  |  | 748 | 765 | 762 | 752 |  | (10) |
2022 |  |  |  |  |  |  |  | 517 | 529 | 525 |  | (4) |
2023 |  |  |  |  |  |  |  |  | 677 | 668 |  | (9) |
2024 |  |  |  |  |  |  |  |  |  | 604 |  |
Total |  | $ | 3,012 |  | $ | 4,886 |  | $ | 7,330 |  | $ | 8,813 |  | $ | 9,851 |  | $ | 10,187 |  | $ | 10,668 |  | $ | 11,276 |  | $ | 11,854 |  | $ | (26) |
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below | (10,970) |  |
Liabilities for losses and allocated loss adjustment expenses and prior year development before 2015, net of reinsurance | (48) |  | 2 |
Unallocated loss adjustment expense prior year adjustment |  | (1) |
Liabilities for losses and loss adjustment expenses and prior year loss development, net of reinsurance | $ | 836 |  | $ | (25) |
The following table provides our attribution of our reinsurance recoverable for the ADC only (included in the table above):
|  | Calendar Years Ended December 31, (in millions) |
Accident Year |  | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | Prior Year Development
|  | Unaudited |  |
2015 |  | $ | (22) |  | $ | (19) |  | $ | (11) |  | $ | (6) |  | $ | (5) |  | $ | (5) |  | $ | (7) |  | $ | (8) |  | $ | (9) |  | $ | (1) |
2016 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2017 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2018 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2019 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2020 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2021 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2022 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2023 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
2024 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
Total |  | $ | (22) |  | $ | (19) |  | $ | (11) |  | $ | (6) |  | $ | (5) |  | $ | (5) |  | $ | (7) |  | $ | (8) |  | $ | (9) |  | $ | (1) |
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below | 9 |  |
Liabilities for losses and allocated loss adjustment expenses and prior year development before 2015, net of reinsurance | — |  | (1) |
Unallocated loss adjustment expense prior year development |  | — |
Liabilities for losses and loss adjustment expenses and prior year loss development, net of reinsurance | $ | — |  | $ | (2) |
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance
| Years Ended December 31, (in millions) |  | Paid Impact of ADC
Accident Year | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 |
| Unaudited |  |  |
2015 | $ | 931 |  | $ | 1,320 |  | $ | 1,411 |  | $ | 1,439 |  | $ | 1,455 |  | $ | 1,461 |  | $ | 1,463 |  | $ | 1,468 |  | $ | 1,471 |  | $ | 1,474 |  |  | $ | (9) |
2016 |  | 857 |  | 1,344 |  | 1,422 |  | 1,460 |  | 1,501 |  | 1,512 |  | 1,518 |  | 1,521 |  | 1,521 |  |  | — |
2017 |  |  | 941 |  | 1,672 |  | 1,896 |  | 1,789 |  | 1,826 |  | 1,852 |  | 1,861 |  | 1,878 |  |  | — |
2018 |  |  |  | 1,227 |  | 1,939 |  | 1,973 |  | 1,789 |  | 1,832 |  | 1,849 |  | 1,881 |  |  | — |
2019 |  |  |  |  | 884 |  | 1,295 |  | 1,379 |  | 1,416 |  | 1,491 |  | 1,516 |  |  | — |
2020 |  |  |  |  |  | 667 |  | 679 |  | 725 |  | 824 |  | 846 |  |  | — |
2021 |  |  |  |  |  |  | 488 |  | 650 |  | 658 |  | 662 |  |  | — |
2022 |  |  |  |  |  |  |  | 372 |  | 401 |  | 406 |  |  | — |
2023 |  |  |  |  |  |  |  |  | 400 |  | 522 |  |  | — |
2024 |  |  |  |  |  |  |  |  |  | 273 |  |  | — |
Total |  |  |  |  |  |  |  |  |  | $ | 10,979 |  |  | $ | (9) |
UK/Europe Casualty and Financial Lines UK/Europe is our largest non-U.S. region for Liability and Financial Lines. UK/Europe Casualty and Financial Lines is composed of third-party coverages including general liability, auto liability, D&O, professional liability and various other coverages throughout both the UK and Continental Europe. These areas are all long-tail in nature and while somewhat diverse in terms of exposures, these lines are often subject to similar trends. These lines are impacted by the underwriting cycle and external judicial trends. The largest share of business is in the UK, but significant business is also written in other European countries such as Germany, France, and Italy. Incurred Losses and Allocated Loss Adjustment Expenses, Undiscounted and Net of Reinsurance*
| Years Ended December 31, (in millions) |  | December 31, 2024
Accident Year | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2024 Prior Year Development | Total of IBNR Liabilities Plus Expected Development on Reported Losses | Cumulative Number of Reported Claims
| Unaudited |  |  |  |
2015 | $ | 1,043 |  | $ | 1,177 |  | $ | 1,166 |  | $ | 1,187 |  | $ | 1,265 |  | $ | 1,184 |  | $ | 1,191 |  | $ | 1,210 |  | $ | 1,221 |  | $ | 1,215 |  | $ | (6) |  | $ | 63 |  | 113,532 |
2016 |  | 1,251 |  | 1,342 |  | 1,421 |  | 1,426 |  | 1,539 |  | 1,536 |  | 1,548 |  | 1,547 |  | 1,618 |  | 71 |  | 143 |  | 142,423 |
2017 |  |  | 1,282 |  | 1,221 |  | 1,151 |  | 1,263 |  | 1,323 |  | 1,311 |  | 1,351 |  | 1,398 |  | 47 |  | 171 |  | 149,728 |
2018 |  |  |  | 1,286 |  | 1,316 |  | 1,416 |  | 1,455 |  | 1,554 |  | 1,596 |  | 1,686 |  | 90 |  | 229 |  | 151,718 |
2019 |  |  |  |  | 1,189 |  | 1,204 |  | 1,276 |  | 1,291 |  | 1,282 |  | 1,307 |  | 25 |  | 210 |  | 142,854 |
2020 |  |  |  |  |  | 1,163 |  | 1,215 |  | 1,161 |  | 1,154 |  | 1,114 |  | (40) |  | 353 |  | 86,254 |
2021 |  |  |  |  |  |  | 1,316 |  | 1,275 |  | 1,279 |  | 1,261 |  | (18) |  | 566 |  | 77,499 |
2022 |  |  |  |  |  |  |  | 1,243 |  | 1,203 |  | 1,197 |  | (6) |  | 681 |  | 74,390 |
2023 |  |  |  |  |  |  |  |  | 1,233 |  | 1,230 |  | (3) |  | 803 |  | 69,733 |
2024 |  |  |  |  |  |  |  |  |  | 1,240 |  |  | 1,052 |  | 60,687 |
Total |  |  |  |  |  |  |  |  |  | $ | 13,266 |  | $ | 160 |  |  |
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below |  | (6,843) |  | — |  |  |
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2015, net of reinsurance |  | 857 |  | 10 |  |  |
Unallocated loss adjustment expense prior year development |  |  | — |  |  |
Liabilities for losses and loss adjustment expenses and prior year loss development, net of reinsurance |  | $ | 7,280 |  | $ | 170 |  |  |
*The losses reported in the table are not covered by the ADC. Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance*
| Years Ended December 31, (in millions)
Accident Year | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024
| Unaudited |
2015 | $ | 69 |  | $ | 230 |  | $ | 416 |  | $ | 546 |  | $ | 656 |  | $ | 828 |  | $ | 914 |  | $ | 955 |  | $ | 1,004 |  | $ | 1,023 |
2016 |  | 115 |  | 363 |  | 563 |  | 746 |  | 896 |  | 1,022 |  | 1,127 |  | 1,214 |  | 1,253 |
2017 |  |  | 93 |  | 269 |  | 428 |  | 578 |  | 724 |  | 862 |  | 924 |  | 1,025 |
2018 |  |  |  | 109 |  | 359 |  | 549 |  | 711 |  | 867 |  | 1,085 |  | 1,172 |
2019 |  |  |  |  | 95 |  | 297 |  | 458 |  | 632 |  | 728 |  | 842 |
2020 |  |  |  |  |  | 57 |  | 218 |  | 351 |  | 484 |  | 572 |
2021 |  |  |  |  |  |  | 49 |  | 224 |  | 331 |  | 434 |
2022 |  |  |  |  |  |  |  | 55 |  | 177 |  | 282 |
2023 |  |  |  |  |  |  |  |  | 35 |  | 183 |
2024 |  |  |  |  |  |  |  |  |  | 57 |
Total |  |  |  |  |  |  |  |  |  | $ | 6,843 |
*The losses reported in the table are not covered by the ADC. UK/Europe Property and Special Risks UK/Europe Property products include commercial, industrial and energy-related property insurance products and services that cover exposures to manmade and natural disasters, including business interruption. UK/Europe Special Risk products include aerospace, environmental, political risk, trade credit, surety and marine insurance, and various small and medium sized enterprises insurance lines. Incurred Losses and Allocated Loss Adjustment Expenses, Undiscounted and Net of Reinsurance*
| Years Ended December 31, (in millions) |  | December 31, 2024
Accident Year | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2024 Prior Year Development | Total of IBNR Liabilities Plus Expected Development on Reported Losses | Cumulative Number of Reported Claims
| Unaudited |  |  |  |
2015 | $ | 1,516 |  | $ | 1,472 |  | $ | 1,457 |  | $ | 1,431 |  | $ | 1,410 |  | $ | 1,400 |  | $ | 1,388 |  | $ | 1,421 |  | $ | 1,407 |  | $ | 1,399 |  | $ | (8) |  | $ | 3 |  | 54,684 |
2016 |  | 1,494 |  | 1,636 |  | 1,661 |  | 1,635 |  | 1,632 |  | 1,626 |  | 1,563 |  | 1,558 |  | 1,553 |  | (5) |  | 17 |  | 57,353 |
2017 |  |  | 1,609 |  | 1,598 |  | 1,576 |  | 1,582 |  | 1,567 |  | 1,533 |  | 1,533 |  | 1,535 |  | 2 |  | 15 |  | 53,528 |
2018 |  |  |  | 1,547 |  | 1,514 |  | 1,493 |  | 1,481 |  | 1,429 |  | 1,427 |  | 1,422 |  | (5) |  | 25 |  | 44,342 |
2019 |  |  |  |  | 1,112 |  | 1,073 |  | 1,076 |  | 1,064 |  | 1,062 |  | 1,065 |  | 3 |  | 45 |  | 33,930 |
2020 |  |  |  |  |  | 1,282 |  | 1,223 |  | 1,181 |  | 1,200 |  | 1,190 |  | (10) |  | 94 |  | 26,280 |
2021 |  |  |  |  |  |  | 995 |  | 958 |  | 914 |  | 923 |  | 9 |  | 85 |  | 22,968 |
2022 |  |  |  |  |  |  |  | 1,098 |  | 1,253 |  | 1,238 |  | (15) |  | 95 |  | 24,972 |
2023 |  |  |  |  |  |  |  |  | 1,034 |  | 1,038 |  | 4 |  | 179 |  | 23,267 |
2024 |  |  |  |  |  |  |  |  |  | 1,081 |  |  | 542 |  | 17,451 |
Total |  |  |  |  |  |  |  |  |  | $ | 12,444 |  | $ | (25) |  |  |
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below |  | (10,174) |  | — |  |  |
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2015, net of reinsurance |  | 85 |  | (10) |  |  |
Unallocated loss adjustment expense prior year development |  |  | — |  |  |
Liabilities for losses and loss adjustment expenses and prior year loss development, net of reinsurance |  | $ | 2,355 |  | $ | (35) |  |  |
*The losses reported in the table are not covered by the ADC. Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance*
| Years Ended December 31, (in millions)
Accident Year | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024
| Unaudited |
2015 | $ | 336 |  | $ | 895 |  | $ | 1,163 |  | $ | 1,263 |  | $ | 1,298 |  | $ | 1,321 |  | $ | 1,329 |  | $ | 1,331 |  | $ | 1,373 |  | $ | 1,377 |
2016 |  | 441 |  | 1,080 |  | 1,327 |  | 1,457 |  | 1,501 |  | 1,528 |  | 1,546 |  | 1,520 |  | 1,522 |
2017 |  |  | 345 |  | 916 |  | 1,193 |  | 1,333 |  | 1,388 |  | 1,426 |  | 1,439 |  | 1,446 |
2018 |  |  |  | 308 |  | 952 |  | 1,131 |  | 1,254 |  | 1,267 |  | 1,301 |  | 1,325 |
2019 |  |  |  |  | 258 |  | 632 |  | 798 |  | 884 |  | 922 |  | 953 |
2020 |  |  |  |  |  | 245 |  | 657 |  | 805 |  | 896 |  | 1,004 |
2021 |  |  |  |  |  |  | 185 |  | 489 |  | 672 |  | 748 |
2022 |  |  |  |  |  |  |  | 190 |  | 650 |  | 1,100 |
2023 |  |  |  |  |  |  |  |  | 150 |  | 504 |
2024 |  |  |  |  |  |  |  |  |  | 195 |
Total |  |  |  |  |  |  |  |  |  | $ | 10,174 |
*The losses reported in the table are not covered by the ADC. UK/Europe and Japan Personal Insurance UK/Europe and Japan Personal Insurance lines consist of accident and health and personal lines. Accident and health products include voluntary and sponsor-paid personal accident and supplemental health products for individuals, employees, associations and other organizations as well as a broad range of travel insurance products and services for leisure and business travelers. Personal lines include automobile and homeowners’ insurance, extended warranty, and consumer specialty products, such as identity theft and credit card protection. Personal lines are generally short-tail in nature. Incurred Losses and Allocated Loss Adjustment Expenses, Undiscounted and Net of Reinsurance*
| Years Ended December 31, (in millions) |  | December 31, 2024
Accident Year | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024 | 2024 Prior Year Development | Total of IBNR Liabilities Plus Expected Development on Reported Losses | Cumulative Number of Reported Claims
| Unaudited |  |  |  |
2015 | $ | 2,153 |  | $ | 2,134 |  | $ | 2,135 |  | $ | 2,127 |  | $ | 2,126 |  | $ | 2,126 |  | $ | 2,126 |  | $ | 2,123 |  | $ | 2,127 |  | $ | 2,128 |  | $ | 1 |  | $ | 2 |  | 1,777,959 |
2016 |  | 2,113 |  | 2,112 |  | 2,099 |  | 2,094 |  | 2,092 |  | 2,090 |  | 2,082 |  | 2,086 |  | 2,084 |  | (2) |  | 3 |  | 1,795,415 |
2017 |  |  | 2,070 |  | 1,995 |  | 1,982 |  | 1,978 |  | 1,995 |  | 1,960 |  | 1,990 |  | 1,989 |  | (1) |  | 4 |  | 1,719,018 |
2018 |  |  |  | 2,372 |  | 2,283 |  | 2,279 |  | 2,251 |  | 2,296 |  | 2,274 |  | 2,272 |  | (2) |  | 1 |  | 1,917,173 |
2019 |  |  |  |  | 1,915 |  | 1,871 |  | 1,834 |  | 1,853 |  | 1,825 |  | 1,827 |  | 2 |  | (1) |  | 1,676,687 |
2020 |  |  |  |  |  | 1,757 |  | 1,627 |  | 1,580 |  | 1,563 |  | 1,552 |  | (11) |  | 5 |  | 1,392,905 |
2021 |  |  |  |  |  |  | 1,626 |  | 1,554 |  | 1,555 |  | 1,555 |  | — |  | 13 |  | 1,394,112 |
2022 |  |  |  |  |  |  |  | 1,710 |  | 1,752 |  | 1,716 |  | (36) |  | 67 |  | 2,072,754 |
2023 |  |  |  |  |  |  |  |  | 1,557 |  | 1,552 |  | (5) |  | 101 |  | 1,435,789 |
2024 |  |  |  |  |  |  |  |  |  | 1,416 |  |  | 177 |  | 1,260,923 |
Total |  |  |  |  |  |  |  |  |  | $ | 18,091 |  | $ | (54) |  |  |
Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance from the table below |  | (16,861) |  | — |  |  |
Liabilities for losses and loss adjustment expenses and prior year development before accident year 2015, net of reinsurance |  | 39 |  | 7 |  |  |
Unallocated loss adjustment expense prior year development |  |  | — |  |  |
Liabilities for losses and loss adjustment expenses and prior year loss development, net of reinsurance |  | $ | 1,269 |  | $ | (47) |  |  |
*The losses reported in the table are not covered by the ADC. Cumulative Paid Losses and Allocated Loss Adjustment Expenses, Net of Reinsurance*
| Years Ended December 31, (in millions)
Accident Year | 2015 | 2016 | 2017 | 2018 | 2019 | 2020 | 2021 | 2022 | 2023 | 2024
| Unaudited |
2015 | $ | 1,155 |  | $ | 1,751 |  | $ | 1,927 |  | $ | 2,020 |  | $ | 2,055 |  | $ | 2,079 |  | $ | 2,096 |  | $ | 2,104 |  | $ | 2,112 |  | $ | 2,117 |
2016 |  | 1,154 |  | 1,723 |  | 1,894 |  | 1,976 |  | 2,019 |  | 2,043 |  | 2,057 |  | 2,065 |  | 2,070 |
2017 |  |  | 1,130 |  | 1,682 |  | 1,830 |  | 1,896 |  | 1,930 |  | 1,949 |  | 1,949 |  | 1,960 |
2018 |  |  |  | 1,426 |  | 1,913 |  | 2,062 |  | 2,139 |  | 2,180 |  | 2,226 |  | 2,250 |
2019 |  |  |  |  | 1,120 |  | 1,576 |  | 1,690 |  | 1,746 |  | 1,777 |  | 1,798 |
2020 |  |  |  |  |  | 937 |  | 1,350 |  | 1,446 |  | 1,485 |  | 1,513 |
2021 |  |  |  |  |  |  | 920 |  | 1,306 |  | 1,408 |  | 1,465 |
2022 |  |  |  |  |  |  |  | 1,006 |  | 1,440 |  | 1,550 |
2023 |  |  |  |  |  |  |  |  | 881 |  | 1,290 |
2024 |  |  |  |  |  |  |  |  |  | 848 |
Total |  |  |  |  |  |  |  |  |  | $ | 16,861 |
*The losses reported in the table are not covered by the ADC. Claims Payout Patterns The following table presents the historical average annual percentage claims payout on an accident year basis at the same level of disaggregation as presented in the claims development table.
Average Annual Percentage Payout of Incurred Losses by Age, Net of Reinsurance (Unaudited)
Year | 1 |  | 2 |  | 3 |  | 4 |  | 5 |  | 6 |  | 7 |  | 8 |  | 9 |  | 10 |
U.S. Workers' compensation | 11.9 | % | 17.5 | % | 11.0 | % | 7.5 | % | 4.5 | % | 3.3 | % | 2.7 | % | 1.2 | % | 1.4 | % | 1.5 | %
U.S. Excess casualty | 1.1 |  | 10.1 |  | 8.9 |  | 19.5 |  | 10.8 |  | 7.2 |  | 6.1 |  | 7.9 |  | 3.1 |  | 2.0 |
U.S. Other casualty | 5.2 |  | 9.7 |  | 13.8 |  | 14.0 |  | 13.3 |  | 8.7 |  | 7.8 |  | 4.0 |  | 3.5 |  | 0.6 |
U.S. Financial Lines | 3.9 |  | 14.0 |  | 16.0 |  | 15.0 |  | 12.3 |  | 8.5 |  | 6.9 |  | 6.2 |  | 4.0 |  | 0.7 |
U.S. Property and Special Risks | 35.6 |  | 31.1 |  | 10.9 |  | 7.1 |  | 5.1 |  | 2.8 |  | 2.2 |  | 1.6 |  | 1.9 |  | 0.2 |
U.S. Personal Insurance | 60.3 |  | 22.9 |  | 4.7 |  | 0.5 |  | 2.5 |  | 1.0 |  | 0.7 |  | 0.5 |  | 0.1 |  | 0.2 |
UK/Europe Casualty and Financial Lines | 5.4 |  | 13.6 |  | 11.5 |  | 10.8 |  | 8.9 |  | 10.7 |  | 5.8 |  | 5.3 |  | 3.2 |  | 1.6 |
UK/Europe Property and Special Risks | 20.9 |  | 37.5 |  | 18.7 |  | 8.2 |  | 3.7 |  | 2.2 |  | 1.1 |  | (0.4) |  | 1.6 |  | 0.3 |
UK/Europe and Japan Personal Insurance | 58.5 |  | 25.8 |  | 7.0 |  | 3.5 |  | 1.8 |  | 1.3 |  | 0.6 |  | 0.4 |  | 0.3 |  | 0.2 |
DISCOUNTING OF LOSS RESERVES At December 31, 2024 and 2023, the loss reserves reflect a net loss reserve discount of $1.2 billion and $1.2 billion, respectively, including tabular and non-tabular calculations based upon the following assumptions: •The non-tabular workers’ compensation discount is calculated separately for companies domiciled in New York, Pennsylvania and Delaware, and follows the statutory regulations (prescribed or historically permitted) for each state. –For New York companies, the discount is based on a 5 percent interest rate and the companies’ own payout patterns. –The Pennsylvania and Delaware regulators have historically approved use of a consistent benchmark discount rate and spread (U.S. Treasury rate plus a liquidity premium) to all of our workers’ compensation reserves in our Pennsylvania domiciled and Delaware domiciled companies, as well as our use of updated payout patterns specific to our primary and excess workers compensation portfolios. Delaware stipulates that the maximum allowable rate is 4.5 percent. We have sought approval to apply a discount rate of 4.5 percent for National Union Fire Insurance Company of Pittsburgh, Pa. and Lexington Insurance Company. In 2020, the regulators also approved that the discount rate will be updated on an annual basis. •The tabular workers’ compensation discount is calculated based on the mortality rate used in the 2007 U.S. Life table and interest rates prescribed or permitted by each state (i.e. New York is based on 5 percent interest rate and Pennsylvania and Delaware are based on U.S. Treasury rate plus a liquidity premium). In the case that applying this tabular discount factor to our nominal reserves produces a tabular discount that is greater than the indemnity portion of our case reserves, the tabular discount is capped at our estimate of the indemnity portion of our cases reserves (45 percent). The discount for asbestos reserves has been fully accreted. At December 31, 2024 and 2023, the discount consists of $107 million and $294 million of tabular discount, respectively, and $1.1 billion and $939 million of non-tabular discount for workers’ compensation, respectively. During the years ended December 31, 2024, 2023 and 2022, the benefit / (charge) from changes in discount of $(226) million, $(195) million and $703 million, respectively, were recorded as part of Losses and loss adjustment expenses incurred in the Consolidated Statements of Income (Loss). The following table presents the components of the loss reserve discount discussed above:
(in millions) |  | December 31, 2024 |  | December 31, 2023
U.S. workers' compensation | $ | 2,111 |  | $ | 2,337 |
Retroactive reinsurance |  | (936) |  |  | (1,104) |
Total reserve discount(a)(b) | $ | 1,175 |  | $ | 1,233 |
(a)Excludes $184 million and $196 million of discount related to certain long-tail liabilities in the UK at December 31, 2024 and 2023, respectively. (b)Includes gross discount of $627 million and $687 million, which was 100 percent ceded to Fortitude Re at December 31, 2024 and 2023, respectively. The following table presents the net loss reserve discount benefit (charge):
Years Ended December 31, |  |  |  |  |  |  |  |  |  |  |
(in millions) |  |  |  |  |  |  | 2024 |  | 2023 |  | 2022
Current accident year |  |  |  |  |  | $ | 128 |  | $ | 112 |  | $ | 98 |
Accretion and other adjustments to prior year discount |  |  |  |  |  |  | (303) |  |  | (264) |  |  | (239) |
Effect of interest rate changes |  |  |  |  |  |  | (51) |  |  | (43) |  |  | 844 |
Net reserve discount benefit (charge) |  |  |  |  |  |  | (226) |  |  | (195) |  |  | 703 |
Change in discount on loss reserves ceded under retroactive reinsurance |  |  |  |  |  |  | 168 |  |  | 150 |  |  | (301) |
Net change in total reserve discount* |  |  |  |  |  | $ | (58) |  | $ | (45) |  | $ | 402 |
*Excludes $(12) million, $61 million and $19 million of discount related to certain long-tail liabilities in the UK for the years ended December 31, 2024, 2023 and 2022, respectively. During 2024, net change in total reserve discount was impacted by updates to future payouts, and despite increases in U.S. Treasury rates, the updated discount rate resulted in a decrease in the total reserve discount due to the implementation of a statutory cap. D uring 2023, net change in total reserve discount was impacted by updates to future payouts, along with a decrease in the discount rate due to an increase in U.S. Treasury rates being offset by a decrease in the discount spread. During 2022, effective interest rates increased due to an increase in the forward yield curve component of the discount rates reflecting an increase in U.S. Treasury rates along with changes in payout pattern assumptions. Amortization of Deferred Gain on Retroactive Reinsurance Amortization of the deferred gain on retroactive reinsurance includes $322 million, $48 million and $189 million related to the adverse development reinsurance cover with NICO for the years ended December 31, 2024, 2023 and 2022, respectively. Amounts recognized reflect the amortization of the initial deferred gain at inception, as amended for subsequent changes in the deferred gain due to changes in subject reserves. FUTURE POLICY BENEFITS Future policy benefits primarily include reserves for traditional life and annuity payout contracts, which represent an estimate of the present value of future benefits less the present value of future net premiums. For traditional and limited pay long-duration products, benefit reserves are accrued and benefit expense is recognized using a net premium ratio methodology for each annual cohort of business. The following tables present the balances and changes in the liability for future policy benefits and a reconciliation of the net liability for future policy benefits to the liability for future policy benefits in the Consolidated Balance Sheets:
Years Ended December 31, |  |  |
(in millions, except for liability durations) | 2024 |  | 2023
Present value of expected net premiums |  |  |
Balance, beginning of year | $ | 1,702 |  |  | $ | 1,929 |
Effect of changes in discount rate assumptions (AOCI) | 339 |  |  | 262 |
Beginning balance at original discount rate | 2,041 |  |  | 2,191 |
Effect of changes in cash flow assumptions | 12 |  |  | (2) |
Effect of actual variances from expected experience | (12) |  |  | (16) |
Adjusted beginning of year balance | 2,041 |  |  | 2,173 |
Issuances | 88 |  |  | 122 |
Interest accrual | 39 |  |  | 43 |
Net premium collected | (254) |  |  | (283) |
Foreign exchange impact | (165) |  |  | (14) |
Ending balance at original discount rate | 1,749 |  |  | 2,041 |
Effect of changes in discount rate assumptions (AOCI) | (203) |  |  | (339) |
Balance, end of year | $ | 1,546 |  |  | $ | 1,702 |
Present value of expected future policy benefits |  |  |
Balance, beginning of year | $ | 2,149 |  |  | $ | 2,380 |
Effect of changes in discount rate assumptions (AOCI) | 441 |  |  | 362 |
Beginning balance at original discount rate | 2,590 |  |  | 2,742 |
Effect of changes in cash flow assumptions | 3 |  |  | (13) |
Effect of actual variances from expected experience | (12) |  |  | (18) |
Adjusted beginning of year balance | 2,581 |  |  | 2,711 |
Issuances | 93 |  |  | 130 |
Interest accrual | 48 |  |  | 52 |
Benefit payments | (262) |  |  | (276) |
Foreign exchange impact | (211) |  |  | (27) |
Ending balance at original discount rate | 2,249 |  |  | 2,590 |
Effect of changes in discount rate assumptions (AOCI) | (273) |  |  | (441) |
Balance, end of year | $ | 1,976 |  |  | $ | 2,149 |
Net liability for future policy benefits, end of year | $ | 430 |  |  | $ | 447 |
Deferred profit liability | 1 |  |  | 1 |
Other reconciling items(a) | 886 |  |  | 1,019 |
Future policy benefits | 1,317 |  |  | 1,467 |
Less: Reinsurance recoverable | (726) |  |  | (823) |
Net liability for future policy benefits after reinsurance recoverable | $ | 591 |  |  | $ | 644 |
Weighted average liability duration of the liability for future policy benefits(b) | 9.1 |  | 9.3
(a)Other reconciling items primarily include Global Accident & Health (short-duration) contracts and certain long-duration contracts that are 100 percent ceded of $691 million and $785 million at December 31, 2024 and 2023, respectively. (b)The weighted average liability durations are calculated as the modified duration using projected future net liability cash flows that are aggregated at the segment level, utilizing the segment level weighted average interest rates and current discount rate, which can be found in the table below. The following table presents the amount of undiscounted expected future benefit payments and undiscounted and discounted expected gross premiums for future policy benefits for nonparticipating contracts*:
Years Ended December 31, |  |  |  |  |  |
(in millions) |  | 2024 |  | 2023 |  | 2022
Undiscounted expected future benefits and expense |  | $ | 2,816 |  |  | $ | 3,194 |  |  | $ | 3,325 |
Undiscounted expected future gross premiums |  | 3,911 |  |  | 4,403 |  |  | 4,558 |
*Discounted expected future gross premiums (at current discount rate) for 2024 and 2023 were $2.8 billion and $3.0 billion, respectively. The following table presents the amount of revenue and interest recognized in the Consolidated Statements of Income (Loss) for future policy benefits for nonparticipating contracts:
Years Ended December 31, |  |  |  |  |  |  |  |  |
(in millions) |  |  |  |  |  |  |  |  | 2024 |  | 2023 |  | 2022
Gross premiums |  |  |  |  |  |  |  |  | $ | 409 |  |  | $ | 477 |  |  | $ | 487 |
Interest accretion |  |  |  |  |  |  |  |  | $ | 9 |  |  | $ | 9 |  |  | $ | 8 |
The following table presents the weighted-average interest rate for future policy benefits for nonparticipating contracts:
Years Ended December 31, | 2024 |  | 2023 |  | 2022
Weighted-average interest rate, original discount rate | 1.83 | % |  | 1.82 | % |  | 1.77 | %
Weighted-average interest rate, current discount rate | 3.22 | % |  | 3.78 | % |  | 3.21 | %
The weighted average interest rates are calculated using projected future net liability cash flows that are aggregated to the segment level, and are represented as an annual rate.

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