Retirement Benefits - Weighted-average allocation of the majority of the assets related to defined benefit plans (Details)	Jun. 30, 2019	Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items]
Equity securities (as a percent)	100.00%	100.00%
U.S. defined benefit plan
Defined Benefit Plan Disclosure [Line Items]
Other investments (as a percent)	75.00%
Equity securities
Defined Benefit Plan Disclosure [Line Items]
Equity securities (as a percent)	43.00%	44.00%
Debt securities (as a percent)	42.00%
Debt securities
Defined Benefit Plan Disclosure [Line Items]
Equity securities (as a percent)	54.00%	49.00%
Debt securities (as a percent)	46.00%
Other investments
Defined Benefit Plan Disclosure [Line Items]
Equity securities (as a percent)	3.00%	7.00%
Debt securities (as a percent)	12.00%

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

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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/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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- Definition

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

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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-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.

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-SubTopic 320
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