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Pensions and Other Postretirement Benefits (Tables)
3 Months Ended
Mar. 31, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Pension and Other Postretirement Benefit Cost Components
Pension and postretirement benefit cost components were as follows:
 Pension BenefitsOther Postretirement Benefits
 First Quarter
 2022202120222021
 ($ in millions)
Service cost$10 $11 $$
Interest cost17 13 
Expected return on plan assets(53)(48)(3)(3)
Amortization of net losses12 17 — — 
Amortization of prior service benefit— — (6)(6)
Net benefit$(14)$(7)$(6)$(5)