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Pensions and Other Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2025
Retirement Benefits [Abstract]  
Net Periodic Benefit Cost
Net periodic pension benefit cost and other postretirement benefit cost for the three and nine months ended September 30, 2025 and 2024 was as follows:

Pension
Three Months Ended
September 30		Nine Months Ended
September 30
($ in millions)2025202420252024
Service cost$3 $2 $7 $6 
Interest cost27 25 78 77 
Expected return on plan assets(27)(28)(79)(82)
Amortization of actuarial losses6 6 18 17 
Settlements1 1 2 9 
Net periodic benefit cost$10 $6 $26 $27 
 Other Postretirement Benefits
 Three Months Ended
September 30		Nine Months Ended
September 30
($ in millions)2025202420252024
Service cost$1 $1 $2 $3 
Interest cost6 5 17 17 
Amortization of actuarial gains(1)— (1)(1)
Amortization of prior service credit(1)(1)(3)(3)
Net periodic benefit cost$5 $5 $15 $16 
Defined Contribution Plan Disclosures
Contributions to Defined Benefit Pension Plans
Three Months Ended
September 30		Nine Months Ended
September 30
($ in millions)2025202420252024
U.S. defined benefit pension contributions$6 $5 $13 $5 
Non-U.S. defined benefit pension contributions$— $— $1 $2