Pension and Other Postretirement Benefits (Schedule of Assumptions Used) (Details)	12 Months Ended
Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Pension Benefits
Weighted-average assumptions used to determine benefit obligations
Discount rate	2.70%	2.80%	3.60%
Weighted-average assumptions used to determine net periodic benefit costs
Expected return on plan assets	6.50%	7.00%	7.00%
Pension Benefits \| Service Cost
Weighted-average assumptions used to determine net periodic benefit costs
Discount rate	2.90%	3.70%	4.60%
Pension Benefits \| Interest Cost
Weighted-average assumptions used to determine net periodic benefit costs
Discount rate	2.20%	3.20%	4.10%
Postretirement Benefits
Weighted-average assumptions used to determine benefit obligations
Discount rate	2.70%	2.80%	3.60%
Postretirement Benefits \| Service Cost
Weighted-average assumptions used to determine net periodic benefit costs
Discount rate	3.00%	3.80%	4.40%
Postretirement Benefits \| Interest Cost
Weighted-average assumptions used to determine net periodic benefit costs
Discount rate	2.20%	3.20%	3.90%

Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan.

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- Definition

Weighted average rate for present value of future retirement benefits cash flows, used to determine net periodic benefit cost of defined benefit plan.

+ References

+ Details

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- Definition

Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (k)(3)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2919-114920

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- References

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- Details

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