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Pensions and Other Postretirement Benefits (Tables)
 6 Months Ended
Jun. 30, 2024
Retirement Benefits [Abstract]  
Net Periodic Benefit Cost
Net periodic pension benefit cost and other postretirement benefit cost for the three and six months ended June 30, 2024 and 2023 was as follows:
Pension
Three Months Ended
June 30		Six Months Ended
June 30
($ in millions)2024202320242023
Service cost$2 $2 $4 $4 
Interest cost26 24 52 55 
Expected return on plan assets(27)(24)(54)(55)
Amortization of actuarial losses5 3 11 10 
Settlements8 1 8 191 
Net periodic benefit cost$14 $6 $21 $205 
 Other Postretirement Benefits
 Three Months Ended
June 30		Six Months Ended
June 30
($ in millions)2024202320242023
Service cost$1 $1 $2 $2 
Interest cost6 6 12 13 
Amortization of actuarial gains(1)(1)(1)(1)
Amortization of prior service credit— (1)(2)(3)
Net periodic benefit cost$6 $5 $11 $11 
Defined Contribution Plan Disclosures
Contributions to Defined Benefit Pension Plans
Three Months Ended
June 30		Six Months Ended
June 30
($ in millions)2024202320242023
Non-U.S. defined benefit pension mandatory contributions$1 $1 $2 $2