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Pensions and Other Postretirement Benefits (Tables)
6 Months Ended
Jun. 30, 2025
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Schedule of Pension and Postretirement Benefit Cost Components
Pension and postretirement benefit cost components were as follows:

 Pension BenefitsOther Postretirement Benefits
 Second Quarter
 2025202420252024
 ($ in millions)
Service cost$$$— $
Interest cost27 27 
Expected return on plan assets(49)(51)(3)(3)
Amortization of net losses— — 
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 $$
Interest cost53 54 
Expected return on plan assets(98)(102)(5)(6)
Amortization of net losses11 — — 
Amortization of prior service benefit— — (11)(12)
Curtailment gain— — — (20)
Net benefit$(22)$(27)$(8)$(29)