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Pensions and Other Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2025
Retirement Benefits [Abstract]  
Net Periodic Benefit Cost
Net periodic pension benefit cost and other postretirement benefit cost for the three months ended March 31, 2025 and 2024 was as follows:
 PensionOther Postretirement Benefits
 Three Months Ended
March 31		Three Months Ended
March 31
($ in millions)2025202420252024
Service cost$2 $2 $1 $1 
Interest cost25 26 5 6 
Expected return on plan assets(26)(27)— — 
Amortization of actuarial losses6 6 — — 
Amortization of prior service credit— — (1)(2)
Settlement1 — — — 
Net periodic benefit cost$8 $7 $5 $5 
Defined Contribution Plan Disclosures
Contributions to Defined Benefit Pension Plans
Three Months Ended
March 31
($ in millions)20252024
Non-U.S. defined benefit pension contributions$— $1