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Components of Net Periodic Benefit Cost
 3 Months Ended
Sep. 30, 2023
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost Components of Net Periodic Benefit Cost
    Net periodic benefit cost for benefit plans included the following components:

Three Months Ended September 30,
($ in millions)20232022
Service cost$4 $4 
Interest cost13 12 
Expected return on plan assets(14)(14)
Amortization of actuarial loss1 1 
Amortization of prior service credit(1)(1)
Settlement costs 1 — 
Net periodic benefit cost$4 $2 

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