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Components of Net Periodic Benefit Cost (Tables)
3 Months Ended
Sep. 30, 2023
Retirement Benefits [Abstract]  
Schedule of Components of Net Benefit Costs Net periodic benefit cost for benefit plans included the following components:
Three Months Ended September 30,
($ in millions)20232022
Service cost$$
Interest cost13 12 
Expected return on plan assets(14)(14)
Amortization of actuarial loss
Amortization of prior service credit(1)(1)
Settlement costs — 
Net periodic benefit cost$4 $2