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Benefit Plans
 12 Months Ended
Dec. 31, 2024
Retirement Benefits [Abstract]  
Benefit Plans Benefit Plans
Defined Benefit Plan
We have a defined benefit plan for certain of our employees, which is non-contributory and eligible employees are fully vested after five years of service. The impact of the liability of the defined benefit plan on our consolidated balance sheets as of December 31, 2024 and 2023 was not material.
Defined Contribution Plans
We offer defined contribution plans to eligible employees in the United States as well as employees in certain other countries. Our expense relating to defined contribution plans was $32 million, $29 million and $27 million for the years ended December 31, 2024, 2023 and 2022, respectively.
Postretirement Benefit Plan
Certain of our employees in the United States participate in a postretirement benefit plan. Our postretirement benefit plan is not funded. The changes in and the amount of the accumulated postretirement benefit obligation were as follows:
As of December 31,
20242023
(in millions)
Accumulated postretirement benefit obligation as of January 1$16 $34 
Service cost— — 
Interest cost1 2 
Benefits paid(2)(2)
Actuarial gains— (18)
Accumulated postretirement benefit obligation as of December 31 $15 $16 
The accrued benefit obligation was included in our consolidated balance sheets as follows:
As of December 31,
20242023
(in millions)
Accrued and other current liabilities$2 $2 
Long-term postretirement benefit obligation13 14 
$15 $16 
A portion of our accrued benefit obligation has been recorded in accumulated other comprehensive income as follows:
As of
December 31, 2022		Changes As of
December 31, 2023		Changes As of
December 31, 2024
(in millions)
Net actuarial gain$29 $15 $44 $(4)$40 
Deferred income tax expense(6)(4)(10)1 (9)
Accumulated other comprehensive income$23 $11 $34 $(3)$31 
We used the following weighted-average assumptions to determine our postretirement benefit obligations:
As of December 31,
20242023
Discount rate5.58 %4.95 %
Health care cost trend rate assumed for next year8.50 %8.00 %
Ultimate trend rate4.40 %4.50 %
Year that the rate reaches the ultimate trend rate20352033
The year-end discount rate for our plan reflects a weighted-average rate from a high-quality corporate bond yield curve that matches the expected duration of the benefit payments. Changes in our discount rates were primarily the result of changes in bond yields year-over-year. Our expected health care cost trend rate is based on historical costs and long-term expectations. We also review our participation rates based on historical actual and expected trends on an annual basis.
Components of Net Periodic Postretirement Costs:
Our total net periodic pension and postretirement benefit cost for each of the years ended December 31, 2024, 2023 and 2022 was not material.
We used the following weighted-average assumptions to determine our net periodic postretirement health care cost:
For the Years Ended December 31,
202420232022
Discount rate4.95 %5.18 %2.90 %
Health care cost trend rate assumed for next year8.00 %7.00 %6.60 %
Ultimate trend rate4.50 %4.50 %4.50 %
Year that the rate reaches the ultimate trend rate203320322029
Future Benefit Payments:
Expected contributions for the next fiscal year equal the estimated benefit payments of $2 million.
Our estimated future benefit payments for our postretirement benefit plan as of December 31, 2024 were as follows:
(in millions)
2025$2 
20262 
20271 
20281 
20291 
2030-20346