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Pensions and Other Postretirement Benefits (Tables)
9 Months Ended
Sep. 30, 2022
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract]  
Pension and Other Postretirement Benefit Cost Components
Pension and postretirement benefit cost components for the third quarter and first nine months were as follows:

 Pension BenefitsOther Postretirement Benefits
 Third Quarter
 2022202120222021
 ($ in millions)
Service cost$10 $10 $$
Interest cost17 14 
Expected return on plan assets(53)(48)(3)(3)
Amortization of net losses12 16 — — 
Amortization of prior service benefit— — (6)(6)
Net benefit$(14)$(8)$(5)$(7)
 Pension BenefitsOther Postretirement Benefits
 First Nine Months
 2022202120222021
 ($ in millions)
Service cost$30 $32 $$
Interest cost51 41 
Expected return on plan assets(160)(144)(9)(9)
Amortization of net losses36 49 — 
Amortization of prior service benefit— — (19)(19)
Net benefit$(43)$(22)$(17)$(18)