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Pension and Other Postretirement Benefit Plans (Tables)
3 Months Ended
Mar. 31, 2024
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 (credit) of such plans consisted of the following components: 
  Three Months Ended
March 31,
20242023
($ in millions)U.S.InternationalU.S.International
Service cost$86 $61 $76 $49 
Interest cost134 74 133 74 
Expected return on plan assets(207)(139)(187)(128)
Amortization of unrecognized prior service credit
— (3)— (3)
Net loss (gain) amortization
10 — (1)
Termination benefits— — — 
Curtailments— — — 
Settlements— — 21 — 
 $26 $(6)$45 $(9)
Other Postretirement Benefit Plans  
Defined Benefit Plan Disclosure [Line Items]  
Net Benefit Costs
The Company provides medical benefits, principally to its eligible U.S. retirees and similar benefits to their dependents, through its other postretirement benefit plans. The net credit of such plans consisted of the following components: 
  Three Months Ended
March 31,
($ in millions)20242023
Service cost$$
Interest cost14 16 
Expected return on plan assets(20)(16)
Amortization of unrecognized prior service credit(11)(12)
Net gain amortization(12)(11)
 $(21)$(15)