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Pensions and Other Postretirement Benefits (Tables)
9 Months Ended
Sep. 30, 2021
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
 2021202020212020
 ($ in millions)
Service cost$10 $10 $$
Interest cost14 19 
Expected return on plan assets(48)(48)(3)(4)
Amortization of net losses16 13 — — 
Amortization of prior service benefit— — (6)(6)
Net benefit$(8)$(6)$(7)$(5)

   Other Postretirement
 Pension BenefitsBenefits
 First Nine Months
 2021202020212020
 ($ in millions)
Service cost$32 $30 $$
Interest cost41 56 
Expected return on plan assets(144)(143)(9)(10)
Amortization of net losses49 39 — 
Amortization of prior service benefit— — (19)(19)
Net benefit$(22)$(18)$(18)$(15)