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Pension, Retiree Medical and Retiree Savings Plans (Tables)
12 Months Ended
Dec. 31, 2024
Retirement Benefits [Abstract]  
Funded status of pension plans
 20242023
Change in benefit obligation:  
Benefit obligation at beginning of year$778 $755 
Service cost
Interest cost42 41 
Benefits paid(45)(34)
Actuarial (gain) loss(3)11 
Benefit obligation at end of year$776 $778 

A significant component of the overall decrease in the Company's benefit obligation for the year ended December 31, 2024, was due to benefits paid during the year partially offset by interest cost on the benefit obligation.

A significant component of the overall increase in the Company's benefit obligation for the year ended December 31, 2023, was due to interest cost on the benefit obligation partially offset by benefits paid during the year.

20242023
Change in plan assets:
Fair value of plan assets at beginning of year$680 $664 
Actual return on plan assets46 
Employer contributions
Benefits paid(45)(34)
Fair value of plan assets at end of year$644 $680 
 Funded status at end of year$(132)$(98)
Amounts recognized in the Consolidated Balance Sheet
Amounts recognized in the Consolidated Balance Sheet:
 20242023
Accrued benefit asset - non-current$— $— 
Accrued benefit liability - current(11)(8)
Accrued benefit liability - non-current(121)(90)
 $(132)$(98)
Pension plans with an accumulated benefit obligation in excess of pan assets
The table below provides information for those pension plan(s) with an accumulated benefit obligation in excess of plan assets. The pension plan(s) included also have a projected benefit obligation in excess of plan assets.
 20242023
Projected benefit obligation$776 $778 
Accumulated benefit obligation764 763 
Fair value of plan assets644 680 
Components of net periodic benefit cost
Components of net periodic benefit cost:
202420232022
Service cost$$$
Interest cost42 41 31 
Amortization of prior service cost(a)
Expected return on plan assets(51)(50)(46)
Amortization of net loss (gain)(1)11 
Net periodic benefit cost (income)$(3)$(4)$

Additional (gain) loss recognized due to:

Settlement charges(b)
$— $— $

(a)Prior service costs are amortized on a straight-line basis over the average remaining service period of employees expected to receive benefits.

(b)Settlement losses result when benefit payments exceed the sum of the service cost and interest cost within a plan during the year. These losses were recorded in Other pension (income) expense.
[1],[2]
Pension losses in accumulated other comprehensive income (loss)
Pension gains (losses) in AOCI:
 20242023
Beginning of year$(87)$(74)
Net actuarial (loss) gain
(42)(13)
Amortization of net loss (gain)
(1)
Amortization of prior service cost
End of year$(127)$(87)
Schedule of Accumulated pre-tax losses recognized in Accumulated Other Comprehensive Income
Accumulated pre-tax losses recognized within AOCI:
 20242023
Actuarial net loss$(125)$(84)
Prior service cost(2)(3)
 $(127)$(87)
Weighted-average assumptions used to determine benefit obligations and net periodic benefit cost
Weighted-average assumptions used to determine benefit obligations at the measurement dates:
 20242023
Discount rate5.80 %5.60 %
Rate of compensation increase3.00 %3.00 %

Weighted-average assumptions used to determine the net periodic benefit cost for fiscal years:
 
2024
2023
2022
Discount rate5.60 %5.60 %3.00 %
Long-term rate of return on plan assets6.35 %6.25 %5.40 %
Rate of compensation increase3.00 %3.00 %3.00 %
Schedule of Changes in Fair Value of Plan Assets
The fair values of our pension plan assets at December 31, 2024 and 2023 by asset category and level within the fair value hierarchy are as follows:

 20242023
Level 1:
Cash$$— 
Cash Equivalents(a)
30 61 
Fixed Income Securities - U.S. Corporate(b)
16 
Level 2:
Equity Securities(b)
212 213 
Fixed Income Securities - U.S. Corporate(c)
21 25 
Fixed Income Securities - U.S. Government and Government Agencies(d)
113 124 
Fixed Income Securities - Other(d)
15 11 
Total assets in the fair value hierarchy409 441 
Investments measured at net asset value(e)
Fixed Income146 132 
Real Assets141 149 
Total fair value of plan assets(f)
$696 $722 

(a)Short-term investments in money market funds.

(b)Securities held in common or collective trusts.
(c)Investments held directly by the Plan.
(d)Includes securities held in common or collective trusts and investments held directly by the Plan.

(e)Includes securities that have been measured at fair value using the net asset value per unit practical expedient due to the absence of readily available market prices. Accordingly, these securities have not been classified in the fair value hierarchy.

(f)2024 and 2023 exclude net unsettled trade payables of $52 million and $42 million, respectively.
[3],[4],[5],[6],[7],[8]
Fair values of pension plan assets As of December 31, 2024, the Plan’s assets consist of the weighted-average target allocation summarized as follows:
Asset CategoryTarget Allocation
Fixed income49 %
Equity securities32 %
Real assets19 %
Expected benefit payments
The benefits expected to be paid in each of the next five years and in the aggregate for the five years thereafter are set forth below:

Year ended:
2025$59 
202663 
202759 
202863 
202958 
2030 - 2034284 
[1] Prior service costs are amortized on a straight-line basis over the average remaining service period of employees expected to receive benefits.
[2] Settlement losses result when benefit payments exceed the sum of the service cost and interest cost within a plan during the year. These losses were recorded in Other pension (income) expense
[3] Includes securities held in common or collective trusts and investments held directly by the Plan.
[4] Includes securities that have been measured at fair value using the net asset value per unit practical expedient due to the absence of readily available market prices. Accordingly, these securities have not been classified in the fair value hierarchy.
[5] Short-term investments in money market funds.
[6] 2024 and 2023 exclude net unsettled trade payables of $52 million and $42 million, respectively.
[7] Securities held in common or collective trusts.
[8] Investments held directly by the Plan.