Retirement Benefits - Weighted-average allocation of the majority of the assets related to defined benefit plans (Details)	Jun. 30, 2020	Jun. 30, 2019
Defined Benefit Plan Disclosure [Line Items]
Weighted-average allocation of assets related to defined benefit plans	100.00%	100.00%
U.S. defined benefit plan
Defined Benefit Plan Disclosure [Line Items]
Percentage of assets held in U.S. defined benefit plans from total defined plan assets	75.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Weighted-average allocation of assets related to defined benefit plans	41.00%	43.00%
Weighted-average target asset allocation	39.00%
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Weighted-average allocation of assets related to defined benefit plans	49.00%	54.00%
Weighted-average target asset allocation	43.00%
Other investments
Defined Benefit Plan Disclosure [Line Items]
Weighted-average allocation of assets related to defined benefit plans	10.00%	3.00%
Weighted-average target asset allocation	18.00%

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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/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 55
-Paragraph 17
-URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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Percentage of actual 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/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(i)
-URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920

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Percent of net assets at close of period. For schedules of investments that are categorized, each category has a percent of net assets for the aggregated value of the Investments in the category.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 946
-SubTopic 320
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-12B(Column D))
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