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Pension and Postretirement Benefit Plans (Schedule of Assumptions) (Details)
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Postretirement      
Weighted average assumptions      
Discount rate 2.75% 2.65%  
Rate of compensation increase 3.50% 3.50%  
Weighted average assumptions      
Discount rate 2.65% 3.45% 4.10%
Rate of compensation increase 3.50% 3.50% 3.50%
Rate of increase in health care cost levels      
Initial level 6.50% 5.50% 6.00%
Ultimate level 5.00% 5.00% 5.00%
Years to ultimate level 6 years 2 years 3 years
United States | Pension      
Weighted average assumptions      
Discount rate 2.55% 2.43%  
Rate of compensation increase 3.01% 3.07%  
Cash balance interest credit rate 2.14% 2.08%  
Weighted average assumptions      
Discount rate 2.43% 3.39% 4.03%
Expected return on plan assets 7.00% 8.00% 8.00%
Rate of compensation increase 3.07% 3.09% 3.50%
International | Pension      
Weighted average assumptions      
Discount rate 1.57% 1.17%  
Weighted average assumptions      
Discount rate 1.17% 2.24% 2.57%
Expected return on plan assets 1.70% 2.20% 3.89%