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Pension and Other Postretirement Benefits (Schedule of Assumptions Used) (Details)
12 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Pension Benefits      
Weighted-average assumptions used to determine benefit obligations      
Discount rate 3.60% 4.20% 3.80%
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 4.60% 4.10% 4.30%
Pension Benefits | Interest Cost      
Weighted-average assumptions used to determine net periodic benefit costs      
Discount rate 4.10% 3.10% 2.70%
Postretirement Benefits      
Weighted-average assumptions used to determine benefit obligations      
Discount rate 3.60%    
Postretirement Benefits | Service Cost      
Weighted-average assumptions used to determine net periodic benefit costs      
Discount rate 4.40%    
Postretirement Benefits | Interest Cost      
Weighted-average assumptions used to determine net periodic benefit costs      
Discount rate 3.90%