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Pension and Other Postretirement Benefits (Schedule of Assumptions Used) (Details)
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Pension Benefits      
Weighted-average assumptions used to determine benefit obligations      
Discount rate 2.80% 3.60% 4.20%
Weighted-average assumptions used to determine net periodic benefit costs      
Expected return on plan assets 7.00% 7.00% 7.00%
Pension Benefits | Service Cost      
Weighted-average assumptions used to determine net periodic benefit costs      
Discount rate 3.70% 4.60% 4.10%
Pension Benefits | Interest Cost      
Weighted-average assumptions used to determine net periodic benefit costs      
Discount rate 3.20% 4.10% 3.10%
Postretirement Benefits      
Weighted-average assumptions used to determine benefit obligations      
Discount rate 2.80% 3.60%  
Postretirement Benefits | Service Cost      
Weighted-average assumptions used to determine net periodic benefit costs      
Discount rate 3.80% 4.40%  
Postretirement Benefits | Interest Cost      
Weighted-average assumptions used to determine net periodic benefit costs      
Discount rate 3.20% 3.90%