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Pensions and Other Postretirement Benefits
 6 Months Ended
Jun. 30, 2025
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Pensions and Other Postretirement Benefits Pensions and Other Postretirement Benefits
 
We have both funded and unfunded defined benefit pension plans covering eligible employees. We also provide specified health care benefits to eligible retired employees; these plans can be amended or terminated at our option.  Under our self-insured retiree health care plan, for those participants who are not Medicare-eligible, certain health care expenses are covered for retired employees and their dependents, reduced by any deductibles, coinsurance, and, in some cases, coverage provided under other group insurance policies. Eligible retired participants and their spouses who are Medicare-eligible are not covered under the self-insured retiree health care plan, but instead are provided with an employer-funded health reimbursement account which can be used for reimbursement of health insurance premiums or eligible out-of-pocket medical expenses.
Pension and postretirement benefit cost components were as follows:

 Pension BenefitsOther Postretirement Benefits
 Second Quarter
 2025202420252024
 ($ in millions)
Service cost$6 $7 $— $1 
Interest cost27 27 4 4 
Expected return on plan assets(49)(51)(3)(3)
Amortization of net losses5 4 — — 
Amortization of prior service benefit— — (5)(6)
Curtailment gain— — — (20)
Net benefit$(11)$(13)$(4)$(24)

 Pension BenefitsOther Postretirement Benefits
 First Six Months
 2025202420252024
 ($ in millions)
Service cost$12 $13 $1 $2 
Interest cost53 54 7 7 
Expected return on plan assets(98)(102)(5)(6)
Amortization of net losses11 8 — — 
Amortization of prior service benefit— — (11)(12)
Curtailment gain— — — (20)
Net benefit$(22)$(27)$(8)$(29)

The service cost component of defined benefit pension cost and postretirement benefit cost are reported within “Compensation and benefits” and all other components are presented in “Other income – net” on the Consolidated Statements of Income.

During the first quarter of 2024, we commenced voluntary and involuntary separation programs to reduce our nonagreement workforce. Through these programs, approximately 350 employees were separated from service by May 2024. In accordance with FASB Accounting Standard Codification (ASC) Topic 715, “Compensation-Retirement Benefits,” we evaluated whether a curtailment of our pension and other postretirement benefit plans had occurred. While the reduction in our workforce did not result in a curtailment to our pension benefit plans, a curtailment to our other postretirement benefit plan did occur as the future years of service of plan participants were reduced in excess of 10%. As a result, we recognized a curtailment gain of $20 million in the second quarter of 2024, the period in which the employees departed the Company, for the impacted portion of the prior service benefit previously recorded within accumulated other comprehensive loss.