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Pension and Other Postretirement Benefit Plans (Tables)
3 Months Ended
Mar. 31, 2022
Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
Net Benefit Costs
The Company has defined benefit pension plans covering eligible employees in the U.S. and in certain of its international subsidiaries. The net periodic benefit cost of such plans (including certain costs reported as part of discontinued operations in the first quarter of 2021) consisted of the following components: 
  Three Months Ended
March 31,
20222021
($ in millions)U.S.InternationalU.S.International
Service cost$99 $75 $100 $92 
Interest cost103 38 96 29 
Expected return on plan assets(196)(101)(188)(104)
Amortization of unrecognized prior service credit
(8)(4)(10)(4)
Net loss amortization56 25 85 41 
Termination benefits— — — 
Curtailments— — 
Settlements— — — 
 $58 $33 $91 $54 
Other Postretirement Benefit Plans  
Defined Benefit Plan Disclosure [Line Items]  
Net Benefit Costs
The Company provides medical benefits, principally to its eligible U.S. retirees and similar benefits to their dependents, through its other postretirement benefit plans. The net credit of such plans consisted of the following components: 
  Three Months Ended
March 31,
($ in millions)20222021
Service cost$12 $13 
Interest cost11 11 
Expected return on plan assets(21)(20)
Amortization of unrecognized prior service credit(25)(25)
 $(23)$(21)