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Pensions and Other Postretirement Benefits (Tables)
6 Months Ended
Jun. 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 second quarter and first six months were as follows:
   Other Postretirement
 Pension BenefitsBenefits
 Second Quarter
 2021202020212020
 ($ in millions)
Service cost$11 $10 $$
Interest cost14 18 
Expected return on plan assets(48)(47)(3)(3)
Amortization of net losses16 13 — 
Amortization of prior service benefit— — (7)(7)
Net benefit$(7)$(6)$(6)$(5)
   Other Postretirement
 Pension BenefitsBenefits
 First Six Months
 2021202020212020
 ($ in millions)
Service cost$22 $20 $$
Interest cost27 37 
Expected return on plan assets(96)(95)(6)(6)
Amortization of net losses33 26 — 
Amortization of prior service benefit— — (13)(13)
Net benefit$(14)$(12)$(11)$(10)