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Employee Benefit Plans | 12 Months Ended
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Dec. 31, 2024
Retirement Benefits [Abstract] |
EMPLOYEE BENEFIT PLANS | 13. EMPLOYEE BENEFIT PLANS Defined Benefit Plans We have defined benefit pension plans, some of which are subject to collective bargaining agreements, that cover most of our employees. These plans provide eligible employees with retirement income based primarily on years of service and compensation during specific periods under final average pay and cash balance formulas. We fund all of our pension plans as required by local regulations. In the U.S., all qualified pension plans are subject to the Employee Retirement Income Security Act’s minimum funding standard. We typically do not fund or fully fund U.S. nonqualified and certain foreign pension plans that are not subject to funding requirements because contributions to these pension plans may be less economic and investment returns may be less attractive than our other investment alternatives. We also provide health care and life insurance benefits for certain retired employees through our postretirement benefit plans. Most of our employees become eligible for these benefits if, while still working for us, they reach normal retirement age or take early retirement. These plans are unfunded, and retired employees share the cost with us. Individuals who became our employees as a result of an acquisition became eligible for postretirement benefits under our plans as determined by the terms of the relevant acquisition agreement. The changes in benefit obligation related to all of our defined benefit plans, the changes in fair value of plan assets(a), and the funded status of our defined benefit plans as of and for the years ended below were as follows (in millions):
| Pension Plans |  | Other Postretirement Benefit Plans
| December 31, |  | December 31,
| 2024 |  | 2023 |  | 2024 |  | 2023
Changes in benefit obligation |  |  |  |  |  |  |
Benefit obligation as of beginning of year | $ | 2,618 |  |  | $ | 2,413 |  |  | $ | 266 |  |  | $ | 258 |
Service cost | 112 |  |  | 111 |  |  | 4 |  |  | 4 |
Interest cost | 125 |  |  | 121 |  |  | 13 |  |  | 13 |
Participant contributions | — |  |  | — |  |  | 24 |  |  | 22 |
Plan amendments | — |  |  | 19 |  |  | — |  |  | — |
Benefits paid | (186) |  |  | (166) |  |  | (41) |  |  | (42) |
Actuarial (gain) loss | (99) |  |  | 110 |  |  | (29) |  |  | 10 |
Foreign currency exchange rate changes | (4) |  |  | 10 |  |  | (2) |  |  | 1 |
Benefit obligation as of end of year | $ | 2,566 |  |  | $ | 2,618 |  |  | $ | 235 |  |  | $ | 266 |
Changes in plan assets (a) |  |  |  |  |  |  |
Fair value of plan assets as of beginning of year | $ | 2,835 |  |  | $ | 2,485 |  |  | $ | — |  |  | $ | — |
Actual return on plan assets | 310 |  |  | 399 |  |  | — |  |  | — |
Company contributions | 76 |  |  | 101 |  |  | 17 |  |  | 20 |
Participant contributions | — |  |  | — |  |  | 24 |  |  | 22 |
Benefits paid | (186) |  |  | (166) |  |  | (41) |  |  | (42) |
Foreign currency exchange rate changes | (6) |  |  | 16 |  |  | — |  |  | — |
Fair value of plan assets as of end of year | $ | 3,029 |  |  | $ | 2,835 |  |  | $ | — |  |  | $ | — |
Reconciliation of funded status (a) |  |  |  |  |  |  |
Fair value of plan assets as of end of year | $ | 3,029 |  |  | $ | 2,835 |  |  | $ | — |  |  | $ | — |
Less: Benefit obligation as of end of year | 2,566 |  |  | 2,618 |  |  | 235 |  |  | 266 |
Funded status as of end of year | $ | 463 |  |  | $ | 217 |  |  | $ | (235) |  |  | $ | (266) |
Accumulated benefit obligation | $ | 2,423 |  |  | $ | 2,450 |  |  | n/a |  | n/a
________________________ (a)Plan assets include only the assets associated with pension plans subject to legal minimum funding standards. Plan assets associated with U.S. nonqualified pension plans are not included here because they are not protected from our creditors and therefore cannot be reflected as a reduction from our obligations under the pension plans. As a result, the reconciliation of funded status does not reflect the effect of plan assets that exist for all of our defined benefit plans. See Note 19 for the assets associated with certain U.S. nonqualified pension plans. The actuarial gain for the year ended December 31, 2024 primarily resulted from an increase in the discount rates used to determine our benefit obligations for our pension plans from 5.01 percent in 2023 to 5.72 percent in 2024. The actuarial loss for the year ended December 31, 2023 primarily resulted from a decrease in the discount rates used to determine our benefit obligations for our pension plans from 5.19 percent in 2022 to 5.01 percent in 2023. The fair value of our plan assets as of December 31, 2024 and 2023 were favorably impacted by the return on plan assets resulting primarily from an improvement in equity market prices during each year. Amounts recognized in our balance sheets for our pension and other postretirement benefit plans include (in millions):
| Pension Plans |  | Other Postretirement Benefit Plans
| December 31, |  | December 31,
| 2024 |  | 2023 |  | 2024 |  | 2023
Deferred charges and other assets, net | $ | 724 |  |  | $ | 482 |  |  | $ | — |  |  | $ | — |
Accrued expenses | (51) |  |  | (32) |  |  | (22) |  |  | (23) |
Other long-term liabilities | (210) |  |  | (233) |  |  | (213) |  |  | (243) |
| $ | 463 |  |  | $ | 217 |  |  | $ | (235) |  |  | $ | (266) |
The following table presents information for our pension plans with projected benefit obligations in excess of plan assets (in millions):
| December 31,
| 2024 |  | 2023
Projected benefit obligation | $ | 260 |  |  | $ | 265 |
Fair value of plan assets | — |  |  | — |
The following table presents information for our pension plans with accumulated benefit obligations in excess of plan assets (in millions):
| December 31,
| 2024 |  | 2023
Accumulated benefit obligation | $ | 220 |  |  | $ | 220 |
Fair value of plan assets | — |  |  | — |
Benefit payments that we expect to pay, including amounts related to expected future services that we expect to receive, are as follows for the years ending December 31 (in millions):
| Pension Benefits |  | Other Postretirement Benefits
2025 | $ | 224 |  |  | $ | 22 |
2026 | 228 |  |  | 21 |
2027 | 222 |  |  | 20 |
2028 | 199 |  |  | 20 |
2029 | 189 |  |  | 19 |
2030-2034 | 1,112 |  |  | 92 |
During 2025, we plan to contribute approximately $130 million to our pension plans and $20 million to our other postretirement benefit plans, respectively. The components of net periodic benefit cost related to our defined benefit plans were as follows (in millions):
| Pension Plans |  | Other Postretirement Benefit Plans
| Year Ended December 31, |  | Year Ended December 31,
| 2024 |  | 2023 |  | 2022 |  | 2024 |  | 2023 |  | 2022
Service cost | $ | 112 |  |  | $ | 111 |  |  | $ | 152 |  |  | $ | 4 |  |  | $ | 4 |  |  | $ | 6 |
Interest cost | 125 |  |  | 121 |  |  | 85 |  |  | 13 |  |  | 13 |  |  | 8 |
Expected return on plan assets | (214) |  |  | (202) |  |  | (192) |  |  | — |  |  | — |  |  | — |
Amortization of: |  |  |  |  |  |  |  |  |  |  |
Net actuarial (gain) loss | (5) |  |  | (6) |  |  | 52 |  |  | (4) |  |  | (6) |  |  | — |
Prior service credit | (10) |  |  | (18) |  |  | (18) |  |  | — |  |  | (4) |  |  | (4) |
Settlement loss | 5 |  |  | 2 |  |  | 61 |  |  | — |  |  | — |  |  | — |
Net periodic benefit cost | $ | 13 |  |  | $ | 8 |  |  | $ | 140 |  |  | $ | 13 |  |  | $ | 7 |  |  | $ | 10 |
The components of net periodic benefit cost other than the service cost component (i.e., the non-service cost components) are included in “other income, net.” Amortization of the net actuarial (gain) loss shown in the preceding table was based on the straight-line amortization of the excess of the unrecognized (gain) loss over 10 percent of the greater of the projected benefit obligation or market-related value of plan assets (smoothed asset value) over the average remaining service period of active employees expected to receive benefits under each respective plan. Amortization of prior service credit shown in the preceding table was based on a straight-line amortization of the credit over the average remaining service period of employees expected to receive benefits under each respective plan. Pre-tax amounts recognized in other comprehensive income (loss) were as follows (in millions):
|  | Pension Plans |  | Other Postretirement Benefit Plans
|  | Year Ended December 31, |  | Year Ended December 31,
|  | 2024 |  | 2023 |  | 2022 |  | 2024 |  | 2023 |  | 2022
Net gain (loss) arising during the year: |  |  |  |  |  |  |  |  |  |  |  |
Net actuarial gain (loss) |  | $ | 195 |  |  | $ | 87 |  |  | $ | 158 |  |  | $ | 29 |  |  | $ | (10) |  |  | $ | 86 |
Prior service cost |  | — |  |  | (19) |  |  | — |  |  | — |  |  | — |  |  | — |
Net (gain) loss reclassified into income: |  |  |  |  |  |  |  |  |  |  |  |
Net actuarial (gain) loss |  | (5) |  |  | (6) |  |  | 53 |  |  | (4) |  |  | (6) |  |  | (1) |
Prior service credit |  | (10) |  |  | (18) |  |  | (18) |  |  | — |  |  | (4) |  |  | (4) |
Settlement loss |  | 5 |  |  | 2 |  |  | 61 |  |  | — |  |  | — |  |  | — |
Effect of exchange rates |  | (2) |  |  | 4 |  |  | — |  |  | (1) |  |  | — |  |  | — |
Total changes in other comprehensive income (loss) |  | $ | 183 |  |  | $ | 50 |  |  | $ | 254 |  |  | $ | 24 |  |  | $ | (20) |  |  | $ | 81 |
The pre-tax amounts in accumulated other comprehensive loss that have not yet been recognized as components of net periodic benefit cost were as follows (in millions):
| Pension Plans |  | Other Postretirement Benefit Plans
| December 31, |  | December 31,
| 2024 |  | 2023 |  | 2024 |  | 2023
Net actuarial (gain) loss | $ | 62 |  |  | $ | 256 |  |  | $ | (96) |  |  | $ | (73) |
Prior service cost | 22 |  |  | 11 |  |  | 1 |  |  | 2 |
Total | $ | 84 |  |  | $ | 267 |  |  | $ | (95) |  |  | $ | (71) |
The weighted-average assumptions used to determine the benefit obligations were as follows:
| Pension Plans |  | Other Postretirement Benefit Plans
| December 31, |  | December 31,
| 2024 |  | 2023 |  | 2024 |  | 2023
Discount rate | 5.72 | % |  | 5.01 | % |  | 5.64 | % |  | 5.01 | %
Rate of compensation increase | 4.04 | % |  | 3.83 | % |  | n/a |  | n/a
Interest crediting rate for cash balance plans | 4.25 | % |  | 3.59 | % |  | n/a |  | n/a
The discount rate assumption used to determine the benefit obligations as of December 31, 2024 and 2023 for the majority of our pension plans and other postretirement benefit plans was based on the Aon AA Only Above Median yield curve and considered the timing of the projected cash outflows under our plans. This curve was designed by Aon, our actuarial consultant, to provide a means for plan sponsors to value the liabilities of their pension plans or postretirement benefit plans. To develop this curve, a hypothetical double-A yield curve represented by a series of annualized individual discount rates with maturities from six months to 99 years is constructed. Each bond issue underlying the double-A yield curve is required to have an average rating of double-A when averaging all available ratings by Moody’s Investors Service, Standard & Poor’s Ratings Services, and Fitch Ratings. Only the bonds representing the 50 percent highest yielding issuances of this double-A yield curve are then included in the Aon AA Only Above Median yield curve. We based our discount rate assumption on the Aon AA Only Above Median yield curve because we believe it is representative of the types of bonds we would use to settle our pension and other postretirement benefit plan liabilities as of those dates. We believe that the yields associated with the bonds used to develop this yield curve reflect the current level of interest rates. The weighted-average assumptions used to determine the net periodic benefit cost were as follows:
| Pension Plans |  | Other Postretirement Benefit Plans
| Year Ended December 31, |  | Year Ended December 31,
| 2024 |  | 2023 |  | 2022 |  | 2024 |  | 2023 |  | 2022
Discount rate | 5.01 | % |  | 5.19 | % |  | 2.94 | % |  | 5.01 | % |  | 5.20 | % |  | 2.96 | %
Expected long-term rate of return on plan assets | 7.29 | % |  | 7.31 | % |  | 6.71 | % |  | n/a |  | n/a |  | n/a
Rate of compensation increase | 3.84 | % |  | 3.76 | % |  | 3.70 | % |  | n/a |  | n/a |  | n/a
Interest crediting rate for cash balance plans | 3.59 | % |  | 3.76 | % |  | 3.03 | % |  | n/a |  | n/a |  | n/a
The assumed health care cost trend rates were as follows:
| December 31,
| 2024 |  | 2023
Health care cost trend rate assumed for the next year | 8.13 | % |  | 6.68 | %
Rate to which the cost trend rate was assumed to decline (the ultimate trend rate) | 4.97 | % |  | 4.97 | %
Year that the rate reaches the ultimate trend rate | 2036 |  | 2032
The following table presents the fair values of the assets of our pension plans (in millions) as of December 31, 2024 and 2023 by level of the fair value hierarchy. Assets categorized in Level 1 of the hierarchy are measured at fair value using a market approach based on unadjusted quoted prices from national securities exchanges. Assets categorized in Level 2 of the hierarchy are measured at net asset value in a market that is not active or using inputs other than quoted prices that are observable. No assets were categorized in Level 3 of the hierarchy as of December 31, 2024 and 2023. As previously noted, we do not fund or fully fund U.S. nonqualified and certain foreign pension plans that are not subject to funding requirements, and we do not fund our other postretirement benefit plans.
| 2024 |  | 2023 |  |  |  |  |  |
| Level 1 |  | Level 2 |  | Total |  | Level 1 |  | Level 2 |  | Total |  |  |  |  |  |
Equity securities (a) | $ | 542 |  |  | $ | — |  |  | $ | 542 |  |  | $ | 585 |  |  | $ | — |  |  | $ | 585 |  |  |  |  |  |  |
Mutual funds | 233 |  |  | — |  |  | 233 |  |  | 223 |  |  | — |  |  | 223 |  |  |  |  |  |  |
Corporate debt instruments | — |  |  | 261 |  |  | 261 |  |  | — |  |  | 251 |  |  | 251 |  |  |  |  |  |  |
Government securities | 81 |  |  | 169 |  |  | 250 |  |  | 86 |  |  | 186 |  |  | 272 |  |  |  |  |  |  |
Common collective trusts (b) | — |  |  | 1,337 |  |  | 1,337 |  |  | — |  |  | 1,078 |  |  | 1,078 |  |  |  |  |  |  |
Pooled separate accounts (c) | — |  |  | 325 |  |  | 325 |  |  | — |  |  | 323 |  |  | 323 |  |  |  |  |  |  |
Private fund | — |  |  | — |  |  | — |  |  | — |  |  | 46 |  |  | 46 |  |  |  |  |  |  |
Insurance contract | — |  |  | 13 |  |  | 13 |  |  | — |  |  | 13 |  |  | 13 |  |  |  |  |  |  |
Interest and dividends receivable | 6 |  |  | — |  |  | 6 |  |  | 6 |  |  | — |  |  | 6 |  |  |  |  |  |  |
Cash and cash equivalents | 64 |  |  | — |  |  | 64 |  |  | 48 |  |  | — |  |  | 48 |  |  |  |  |  |  |
Securities transactions payable, net | (2) |  |  | — |  |  | (2) |  |  | (10) |  |  | — |  |  | (10) |  |  |  |  |  |  |
Total pension plan assets | $ | 924 |  |  | $ | 2,105 |  |  | $ | 3,029 |  |  | $ | 938 |  |  | $ | 1,897 |  |  | $ | 2,835 |  |  |  |  |  |  |
________________________ (a)This class of securities includes domestic and international securities, which are held in a wide range of industry sectors. (b)This class primarily includes investments in approximately 70 percent equities and 30 percent bonds as of December 31, 2024. As of December 31, 2023, this class primarily included investments in approximately 80 percent equities and 20 percent bonds. (c)This class primarily includes investments in approximately 45 percent equities and 55 percent bonds as of December 31, 2024 and 2023. The investment policies and strategies for the assets of our pension plans incorporate a well-diversified approach that is expected to earn long-term returns from capital appreciation and a growing stream of current income. This approach recognizes that assets are exposed to risk and the market value of the pension plans’ assets may fluctuate from year to year. Risk tolerance is determined based on our financial ability to withstand risk within the investment program and the willingness to accept return volatility. In line with the investment return objective and risk parameters, the pension plans’ mix of assets includes a diversified portfolio of equity and fixed-income investments. Equity securities include international securities and a blend of U.S. growth and value stocks of various sizes of capitalization. Fixed income securities include bonds and notes issued by the U.S. government and its agencies, corporate bonds, and mortgage-backed securities. The aggregate asset allocation is reviewed on an annual basis. As of December 31, 2024, the target allocations for plan assets under our primary pension plan are 65 percent equity securities and 35 percent fixed income investments. The expected long-term rate of return on plan assets is based on a forward-looking expected asset return model. This model derives an expected rate of return based on the target asset allocation of a plan’s assets. The underlying assumptions regarding expected rates of return for each asset class reflect Aon’s best expectations for these asset classes. The model reflects the positive effect of periodic rebalancing among diversified asset classes. We select an expected asset return that is supported by this model. Defined Contribution Plans We have defined contribution plans that cover most of our employees. Our contributions to these plans are based on employees’ compensation and/or a partial match of employee contributions to the plans. Our contributions to these defined contribution plans were $92 million, $87 million, and $83 million for the years ended December 31, 2024, 2023, and 2022, respectively.

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- Definition The entire disclosure of an entity's employee compensation and benefit plans, excluding share-based compensation and including, but not limited to, postemployment and postretirement benefit plans, defined benefit pension plans, defined contribution plans, non-qualified and supplemental benefit plans, deferred compensation, life insurance, severance, health care, unemployment and other benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 710 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/710/tableOfContent Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 712 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/712/tableOfContent Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 715 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/715/tableOfContent + Details
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