Pension and Postretirement Benefit Plans (Schedule of plan assets, allocations by asset category) (Details) - Pension	Jun. 30, 2018	Jun. 30, 2017
Domestic
Defined Benefit Plan Disclosure [Line Items]
Target plan assets allocation	100.00%	100.00%
Actual plan assets allocation	100.00%	100.00%
Domestic \| Equity securities
Defined Benefit Plan Disclosure [Line Items]
Target plan assets allocation	70.00%	70.00%
Actual plan assets allocation	70.00%	71.00%
Domestic \| Fixed-income securities
Defined Benefit Plan Disclosure [Line Items]
Target plan assets allocation	30.00%	30.00%
Actual plan assets allocation	30.00%	29.00%
Domestic \| Other securities
Defined Benefit Plan Disclosure [Line Items]
Target plan assets allocation	0.00%	0.00%
Actual plan assets allocation	0.00%	0.00%
International
Defined Benefit Plan Disclosure [Line Items]
Target plan assets allocation	100.00%
Actual plan assets allocation	100.00%
International \| Equity securities
Defined Benefit Plan Disclosure [Line Items]
Target plan assets allocation	32.00%
Actual plan assets allocation	18.00%
International \| Fixed-income securities
Defined Benefit Plan Disclosure [Line Items]
Target plan assets allocation	17.00%
Actual plan assets allocation	29.00%
International \| Other securities
Defined Benefit Plan Disclosure [Line Items]
Target plan assets allocation	51.00%
Actual plan assets allocation	53.00%

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- Definition

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(5)(i)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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- Definition

Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2446-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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