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Pensions and Other Postretirement Benefits (Tables)
9 Months Ended
Sep. 30, 2020
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:
   Other Postretirement
 Pension BenefitsBenefits
 Third Quarter
 2020201920202019
 ($ in millions)
Service cost$10 $$$
Interest cost19 24 
Expected return on plan assets(48)(45)(4)(4)
Amortization of net losses13 11 — — 
Amortization of prior service benefit— — (6)(6)
Net benefit$(6)$(1)$(5)$(4)

   Other Postretirement
 Pension BenefitsBenefits
 First Nine Months
 2020201920202019
 ($ in millions)
Service cost$30 $26 $$
Interest cost56 70 13 
Expected return on plan assets(143)(134)(10)(11)
Amortization of net losses39 33 — — 
Amortization of prior service benefit— — (19)(18)
Net benefit$(18)$(5)$(15)$(11)