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Pensions and Other Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2024
Retirement Benefits [Abstract]  
Net Periodic Benefit Cost
Net periodic pension benefit cost and other postretirement benefit cost for the three months ended March 31, 2024 and 2023 was as follows:
 PensionOther Postretirement Benefits
 Three Months Ended
March 31		Three Months Ended
March 31
($ in millions)2024202320242023
Service cost$2 $2 $1 $1 
Interest cost26 31 6 7 
Expected return on plan assets(27)(31)— — 
Amortization of actuarial losses6 7 — — 
Amortization of prior service credit— — (2)(2)
Settlement— 190 — — 
Net periodic benefit cost$7 $199 $5 $6 
Defined Contribution Plan Disclosures
Contributions to Defined Benefit Pension Plans
Three Months Ended
March 31
($ in millions)20242023
Non-U.S. defined benefit pension mandatory contributions$1 $1