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Pension and Other Postretirement Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2025
Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of 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
September 30,		Nine Months Ended
September 30,
2025202420252024
($ in millions)U.S.InternationalU.S.InternationalU.S.InternationalU.S.International
Service cost$100 $57 $100 $60 $279 $171 $273 $182 
Interest cost143 78 134 74 425 225 403 220 
Expected return on plan assets(210)(159)(206)(139)(630)(454)(621)(416)
Amortization of unrecognized prior service credit
— (4)— (3)— (12)— (10)
Net loss amortization
16 3 12 1 42 8 30 4 
Termination benefits— — 1 — 1 — 5 — 
Curtailments9 (16)— — 8 (16)— — 
 $58 $(41)$41 $(7)$125 $(78)$90 $(20)
Other Postretirement Benefit Plans  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Net Benefit Costs
The Company provides medical benefits, principally to its eligible U.S. retirees and similar benefits to their dependents, through its other postretirement benefit plans. The net credit of such plans consisted of the following components: 
  Three Months Ended
September 30,		Nine Months Ended
September 30,
($ in millions)2025202420252024
Service cost$9 $7 $29 $23 
Interest cost15 14 46 42 
Expected return on plan assets(13)(20)(39)(60)
Amortization of unrecognized prior service credit(10)(11)(30)(32)
Net gain amortization(12)(14)(33)(38)
 $(11)$(24)$(27)$(65)