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Components of Net Periodic Benefit Cost (Tables)
3 Months Ended
Sep. 30, 2020
Retirement Benefits [Abstract]  
Schedule of Components of Net Benefit Costs Net periodic benefit cost for benefit plans include the following components:
Three Months Ended September 30,
($ in millions)20202019
Service cost$$
Interest cost10 12 
Expected return on plan assets(15)(18)
Amortization of net loss
Net periodic benefit cost$3 $2