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Pensions and Other Postretirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2024
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, 2024 and 2023 was as follows:
Pension
Three Months Ended
September 30		Nine Months Ended
September 30
($ in millions)2024202320242023
Service cost$2 $2 $6 $6 
Interest cost25 28 77 83 
Expected return on plan assets(28)(28)(82)(83)
Amortization of actuarial losses6 6 17 16 
Settlements1 — 9 191 
Net periodic benefit cost$6 $8 $27 $213 
 Other Postretirement Benefits
 Three Months Ended
September 30		Nine Months Ended
September 30
($ in millions)2024202320242023
Service cost$1 $1 $3 $3 
Interest cost5 7 17 20 
Amortization of actuarial gains— — (1)(1)
Amortization of prior service credit(1)(2)(3)(5)
Net periodic benefit cost$5 $6 $16 $17 
Defined Contribution Plan Disclosures
Contributions to Defined Benefit Pension Plans
Three Months Ended
September 30		Nine Months Ended
September 30
($ in millions)2024202320242023
U.S. defined benefit pension plan mandatory contributions$5 $— $5 $— 
Non-U.S. defined benefit pension mandatory contributions— 1 2 3 
Total defined benefit pension mandatory contributions$5 $1 $7 $3