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Pensions and Other Postretirement Benefits (Tables)
3 Months Ended
Mar. 31, 2024
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Schedule of Pension and Other Postretirement Benefit Cost Components
Pension and postretirement benefit cost components were as follows:

 Pension BenefitsOther Postretirement Benefits
 First Quarter
 2024202320242023
 ($ in millions)
Service cost$$$$
Interest cost27 27 
Expected return on plan assets(51)(52)(3)(3)
Amortization of net losses— — 
Amortization of prior service benefit— — (6)(6)
Net benefit$(14)$(18)$(5)$(4)