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Components of Net Periodic Benefit Cost
 3 Months Ended
Sep. 30, 2025
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost Components of Net Periodic Benefit Cost
    Net periodic benefit cost for defined benefit plans includes the following components:

Three Months Ended September 30,
($ in millions)20252024
Service cost$5 $4 
Interest cost22 13 
Expected return on plan assets(24)(13)
Amortization of actuarial loss2 1 
Amortization of prior service credit(1)(1)
Net periodic benefit cost$4 $4 

    Service cost is included in operating income. All other components of net periodic benefit cost are recorded within other non-operating income/(expenses), net.